diff --git a/index.html b/index.html
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+++ b/index.html
@@ -40,38 +40,38 @@ <h2>Additional Reading</h2>
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   <div class="col-sm-3 text-center">
-    <p><a href="http://www.amazon.com/gp/product/B00CITNQIE/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B00CITNQIE&linkCode=as2&tag=opencartcom-20&linkId=ER7T25QTZGAWMUVH" target="_blank"><img src="image/books/51ll6fv8B0L._AA160_.jpg" title="Instant E-commerce with OpenCart: Build a Shop How-to" class="img-thumbnail" /></a></p>
-    <p><a href="http://www.amazon.com/gp/product/B00CITNQIE/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B00CITNQIE&linkCode=as2&tag=opencartcom-20&linkId=ER7T25QTZGAWMUVH" target="_blank">Instant E-commerce with OpenCart: Build a Shop How-to</a></p>
+    <p><a href="https://www.amazon.com/gp/product/B00CITNQIE/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B00CITNQIE&linkCode=as2&tag=opencartcom-20&linkId=ER7T25QTZGAWMUVH" target="_blank"><img src="image/books/51ll6fv8B0L._AA160_.jpg" title="Instant E-commerce with OpenCart: Build a Shop How-to" class="img-thumbnail" /></a></p>
+    <p><a href="https://www.amazon.com/gp/product/B00CITNQIE/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B00CITNQIE&linkCode=as2&tag=opencartcom-20&linkId=ER7T25QTZGAWMUVH" target="_blank">Instant E-commerce with OpenCart: Build a Shop How-to</a></p>
   </div>
   <div class="col-sm-3 text-center">
-    <p><a href="http://www.amazon.com/gp/product/1849514305/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1849514305&linkCode=as2&tag=opencartcom-20&linkId=HLZ3V4KFT5PUUJYS" target="_blank"><img src="image/books/51JXuGw37JL._AA160_.jpg" title="OpenCart 1.4 Template Design Cookbook" class="img-thumbnail" /></a></p>
-    <p><a href="http://www.amazon.com/gp/product/1849514305/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1849514305&linkCode=as2&tag=opencartcom-20&linkId=HLZ3V4KFT5PUUJYS" target="_blank">OpenCart 1.4 Template Design Cookbook</a></p>
+    <p><a href="https://www.amazon.com/gp/product/1849514305/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1849514305&linkCode=as2&tag=opencartcom-20&linkId=HLZ3V4KFT5PUUJYS" target="_blank"><img src="image/books/51JXuGw37JL._AA160_.jpg" title="OpenCart 1.4 Template Design Cookbook" class="img-thumbnail" /></a></p>
+    <p><a href="https://www.amazon.com/gp/product/1849514305/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1849514305&linkCode=as2&tag=opencartcom-20&linkId=HLZ3V4KFT5PUUJYS" target="_blank">OpenCart 1.4 Template Design Cookbook</a></p>
   </div>
   <div class="col-sm-3 text-center">
-    <p><a href="http://www.amazon.com/gp/product/B00MH2D3DK/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B00MH2D3DK&linkCode=as2&tag=opencartcom-20&linkId=YSASOBFK7U2FRUD5" target="_blank"><img src="image/books/51h9ZcKSeEL._AA160_.jpg" title="Customising OpenCart (Revised Edition) 1.5.6.4" class="img-thumbnail" /></a></p>
-    <p><a href="http://www.amazon.com/gp/product/B00MH2D3DK/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B00MH2D3DK&linkCode=as2&tag=opencartcom-20&linkId=YSASOBFK7U2FRUD5" target="_blank">Customising OpenCart (Revised Edition) 1.5.6.4</a></p>
+    <p><a href="https://www.amazon.com/gp/product/B00MH2D3DK/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B00MH2D3DK&linkCode=as2&tag=opencartcom-20&linkId=YSASOBFK7U2FRUD5" target="_blank"><img src="image/books/51h9ZcKSeEL._AA160_.jpg" title="Customising OpenCart (Revised Edition) 1.5.6.4" class="img-thumbnail" /></a></p>
+    <p><a href="https://www.amazon.com/gp/product/B00MH2D3DK/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B00MH2D3DK&linkCode=as2&tag=opencartcom-20&linkId=YSASOBFK7U2FRUD5" target="_blank">Customising OpenCart (Revised Edition) 1.5.6.4</a></p>
   </div>
   <div class="col-sm-3 text-center">
-    <p><a href="http://www.amazon.com/gp/product/B00ZIP43BE/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B00ZIP43BE&linkCode=as2&tag=opencartcom-20&linkId=HZODAD6XGT35RDTW" target="_blank"><img src="image/books/51Bv7fIAEbL._AA160_.jpg" title="OpenCart Theme and Module Development" class="img-thumbnail" /></a></p>
-    <p><a href="http://www.amazon.com/gp/product/B00ZIP43BE/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B00ZIP43BE&linkCode=as2&tag=opencartcom-20&linkId=HZODAD6XGT35RDTW" target="_blank">OpenCart Theme and Module Development</a></p>
+    <p><a href="https://www.amazon.com/gp/product/B00ZIP43BE/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B00ZIP43BE&linkCode=as2&tag=opencartcom-20&linkId=HZODAD6XGT35RDTW" target="_blank"><img src="image/books/51Bv7fIAEbL._AA160_.jpg" title="OpenCart Theme and Module Development" class="img-thumbnail" /></a></p>
+    <p><a href="https://www.amazon.com/gp/product/B00ZIP43BE/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B00ZIP43BE&linkCode=as2&tag=opencartcom-20&linkId=HZODAD6XGT35RDTW" target="_blank">OpenCart Theme and Module Development</a></p>
   </div>
 </div>
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   <div class="col-sm-3 text-center">
-    <p><a href="http://www.amazon.com/gp/product/B00G9309HQ/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B00G9309HQ&linkCode=as2&tag=opencartcom-20&linkId=QCBMS4WUWNU5KBVF" target="_blank"><img src="image/books/51CjtFtxAiL._AA160_.jpg" title="Getting Started with OpenCart Module Development" class="img-thumbnail" /></a></p>
-    <p><a href="http://www.amazon.com/gp/product/B00G9309HQ/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B00G9309HQ&linkCode=as2&tag=opencartcom-20&linkId=QCBMS4WUWNU5KBVF" target="_blank">Getting Started with OpenCart Module Development</a></p>
+    <p><a href="https://www.amazon.com/gp/product/B00G9309HQ/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B00G9309HQ&linkCode=as2&tag=opencartcom-20&linkId=QCBMS4WUWNU5KBVF" target="_blank"><img src="image/books/51CjtFtxAiL._AA160_.jpg" title="Getting Started with OpenCart Module Development" class="img-thumbnail" /></a></p>
+    <p><a href="https://www.amazon.com/gp/product/B00G9309HQ/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B00G9309HQ&linkCode=as2&tag=opencartcom-20&linkId=QCBMS4WUWNU5KBVF" target="_blank">Getting Started with OpenCart Module Development</a></p>
   </div>
   <div class="col-sm-3 text-center">
-    <p><a href="http://www.amazon.com/gp/product/B005XZI98M/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B005XZI98M&linkCode=as2&tag=opencartcom-20&linkId=SS3VETXGNUCZMU6K" target="_blank"><img src="image/books/51gWFh72UsL._AA160_.jpg" title="OpenCart 1.4: Beginner's Guide" class="img-thumbnail" /></a></p>
-    <p><a href="http://www.amazon.com/gp/product/B005XZI98M/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B005XZI98M&linkCode=as2&tag=opencartcom-20&linkId=SS3VETXGNUCZMU6K" target="_blank">OpenCart 1.4: Beginner's Guide</a></p>
+    <p><a href="https://www.amazon.com/gp/product/B005XZI98M/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B005XZI98M&linkCode=as2&tag=opencartcom-20&linkId=SS3VETXGNUCZMU6K" target="_blank"><img src="image/books/51gWFh72UsL._AA160_.jpg" title="OpenCart 1.4: Beginner's Guide" class="img-thumbnail" /></a></p>
+    <p><a href="https://www.amazon.com/gp/product/B005XZI98M/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B005XZI98M&linkCode=as2&tag=opencartcom-20&linkId=SS3VETXGNUCZMU6K" target="_blank">OpenCart 1.4: Beginner's Guide</a></p>
   </div>
   <div class="col-sm-3 text-center">
-    <p><a href="http://www.amazon.com/gp/product/6020209466/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=6020209466&linkCode=as2&tag=opencartcom-20&linkId=4PYYNTZINGBPK4AZ" target="_blank"><img src="image/books/51VIBvqJVjL._AA160_.jpg" title="Membuat Sendiri Toko Online dengan Opencart (Indonesian Edition)" class="img-thumbnail" /></a></p>
-    <p><a href="http://www.amazon.com/gp/product/6020209466/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=6020209466&linkCode=as2&tag=opencartcom-20&linkId=4PYYNTZINGBPK4AZ" target="_blank">Membuat Sendiri Toko Online dengan Opencart (Indonesian Edition)</a></p>
+    <p><a href="https://www.amazon.com/gp/product/6020209466/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=6020209466&linkCode=as2&tag=opencartcom-20&linkId=4PYYNTZINGBPK4AZ" target="_blank"><img src="image/books/51VIBvqJVjL._AA160_.jpg" title="Membuat Sendiri Toko Online dengan Opencart (Indonesian Edition)" class="img-thumbnail" /></a></p>
+    <p><a href="https://www.amazon.com/gp/product/6020209466/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=6020209466&linkCode=as2&tag=opencartcom-20&linkId=4PYYNTZINGBPK4AZ" target="_blank">Membuat Sendiri Toko Online dengan Opencart (Indonesian Edition)</a></p>
   </div>
   <div class="col-sm-3 text-center">
-    <p><a href="http://www.amazon.com/gp/product/B00IO4XNSK/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B00IO4XNSK&linkCode=as2&tag=opencartcom-20&linkId=P55ZQIY37OUXJV74" target="_blank"><img src="image/books/51zKU2GHerL._AA160_.jpg" title="OpenCart kompakt (Web-Edition) (German Edition)" class="img-thumbnail" /></a></p>
-    <p><a href="http://www.amazon.com/gp/product/B00IO4XNSK/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B00IO4XNSK&linkCode=as2&tag=opencartcom-20&linkId=P55ZQIY37OUXJV74" target="_blank">OpenCart kompakt (Web-Edition) (German Edition)</a></p>
+    <p><a href="https://www.amazon.com/gp/product/B00IO4XNSK/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B00IO4XNSK&linkCode=as2&tag=opencartcom-20&linkId=P55ZQIY37OUXJV74" target="_blank"><img src="image/books/51zKU2GHerL._AA160_.jpg" title="OpenCart kompakt (Web-Edition) (German Edition)" class="img-thumbnail" /></a></p>
+    <p><a href="https://www.amazon.com/gp/product/B00IO4XNSK/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B00IO4XNSK&linkCode=as2&tag=opencartcom-20&linkId=P55ZQIY37OUXJV74" target="_blank">OpenCart kompakt (Web-Edition) (German Edition)</a></p>
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@@ -80,23 +80,23 @@ <h2>Additional Reading</h2>
     <p><a href="http://www.amazon.com/gp/product/1468142364/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1468142364&linkCode=as2&tag=opencartcom-20&linkId=XHDODIWCOF5W5EFB" target="_blank">ShowMe Guides OpenCart 1.5 User Manual</a></p>
   </div>
   <div class="col-sm-3 text-center">
-    <p><a href="http://www.opencartgids.nl/opencart-handleiding1?tracking=59c390e88336c" target="_blank"><img src="image/books/gebruikersgids-opencart-1.5.jpg" title="OPENCART GEBRUIKERSGIDS V1.5+" class="img-thumbnail" /></a></p>
-    <p><a href="http://www.opencartgids.nl/opencart-handleiding1?tracking=59c390e88336c" target="_blank">OPENCART GEBRUIKERSGIDS V1.5+</a></p>
+    <p><a href="https://www.opencartgids.nl/opencart-handleiding1?tracking=59c390e88336c" target="_blank"><img src="image/books/gebruikersgids-opencart-1.5.jpg" title="OPENCART GEBRUIKERSGIDS V1.5+" class="img-thumbnail" /></a></p>
+    <p><a href="https://www.opencartgids.nl/opencart-handleiding1?tracking=59c390e88336c" target="_blank">OPENCART GEBRUIKERSGIDS V1.5+</a></p>
   </div>
   <div class="col-sm-3 text-center">
-    <p><a href="http://www.opencartgids.nl/opencart-handleiding-v2?tracking=59c390e88336c" target="_blank"><img src="image/books/gebruikersgids-opencart-2.0.jpg" title="OPENCART GEBRUIKERSGIDS V2.0+" class="img-thumbnail" /></a></p>
-    <p><a href="http://www.opencartgids.nl/opencart-handleiding-v2?tracking=59c390e88336c" target="_blank">OPENCART GEBRUIKERSGIDS V2.0+</a></p>
+    <p><a href="https://www.opencartgids.nl/opencart-handleiding-v2?tracking=59c390e88336c" target="_blank"><img src="image/books/gebruikersgids-opencart-2.0.jpg" title="OPENCART GEBRUIKERSGIDS V2.0+" class="img-thumbnail" /></a></p>
+    <p><a href="https://www.opencartgids.nl/opencart-handleiding-v2?tracking=59c390e88336c" target="_blank">OPENCART GEBRUIKERSGIDS V2.0+</a></p>
   </div>
   <div class="col-sm-3 text-center">
-    <p><a href="http://www.opencartgids.nl/opencart-handleiding-v3?tracking=59c390e88336c" target="_blank"><img src="image/books/gebruikersgids-opencart-3.0.jpg" title="OPENCART GEBRUIKERSGIDS V3.0+" class="img-thumbnail" /></a></p>
-    <p><a href="http://www.opencartgids.nl/opencart-handleiding-v3?tracking=59c390e88336c" target="_blank">OPENCART GEBRUIKERSGIDS V3.0+</a></p>
+    <p><a href="https://www.opencartgids.nl/opencart-handleiding-v3?tracking=59c390e88336c" target="_blank"><img src="image/books/gebruikersgids-opencart-3.0.jpg" title="OPENCART GEBRUIKERSGIDS V3.0+" class="img-thumbnail" /></a></p>
+    <p><a href="https://www.opencartgids.nl/opencart-handleiding-v3?tracking=59c390e88336c" target="_blank">OPENCART GEBRUIKERSGIDS V3.0+</a></p>
   </div>
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   <div class="col-sm-3 text-center">
-    <p><a href="http://www.amazon.com/gp/product/B009FC18Q4/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B009FC18Q4&linkCode=as2&tag=opencartcom-20&linkId=AQWDWR3IVW5TLJZY" target="_blank"><img src="image/books/41T61nCi4ZL._AA160_.jpg" title="OpenCart User Guide 1.5" class="img-thumbnail" /></a></p>
-    <p><a href="http://www.amazon.com/gp/product/B009FC18Q4/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B009FC18Q4&linkCode=as2&tag=opencartcom-20&linkId=AQWDWR3IVW5TLJZY" target="_blank">OpenCart User Guide 1.5</a></p>
+    <p><a href="https://www.amazon.com/gp/product/B009FC18Q4/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B009FC18Q4&linkCode=as2&tag=opencartcom-20&linkId=AQWDWR3IVW5TLJZY" target="_blank"><img src="image/books/41T61nCi4ZL._AA160_.jpg" title="OpenCart User Guide 1.5" class="img-thumbnail" /></a></p>
+    <p><a href="https://www.amazon.com/gp/product/B009FC18Q4/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B009FC18Q4&linkCode=as2&tag=opencartcom-20&linkId=AQWDWR3IVW5TLJZY" target="_blank">OpenCart User Guide 1.5</a></p>
   </div>
 </div>
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