add book recommendation for less

diff --git a/assets/img/refs/lesscss.jpg b/assets/img/refs/lesscss.jpg
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Binary files /dev/null and b/assets/img/refs/lesscss.jpg differ

diff --git a/index.html b/index.html
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--- a/index.html
+++ b/index.html
@@ -570,16 +570,16 @@
             <div class="preview">
               <div class="image">
                 
-                <a onClick="_gaq.push(['_trackEvent', 'refs', 'amazon', 'javascriptandjquery']);" href="http://www.amazon.com/gp/product/1449399029/ref=as_li_tf_tl?ie=UTF8&tag=bootswatch-20&linkCode=as2&camp=1789&creative=9325&creativeASIN=1449399029" target="_blank"><img class="img-responsive" src="assets/img/refs/javascriptandjquery.png" alt="JavaScript and jQuery: The Missing Manual, by David Sawyer McFarland"></a>
+                <a onClick="_gaq.push(['_trackEvent', 'refs', 'amazon', 'lesscss']);" href="http://www.amazon.com/gp/product/178216376X/ref=as_li_tf_tl?ie=UTF8&tag=bootswatch-20&linkCode=as2&camp=1789&creative=9325&creativeASIN=178216376X" target="_blank"><img class="img-responsive" src="assets/img/refs/lesscss.jpg" alt="Instant LESS CSS Preprocessor How-to, by Alex Libby"></a>
 
               </div>
               <div class="options">
                 
-                <h3>JavaScript &amp; jQuery</h3>
-                <p>David Sawyer McFarland</p>
+                <h3>Instant LESS</h3>
+                <p>Alex Libby</p>
                 <div>
                   <img src="http://www.assoc-amazon.com/e/ir?t=bootswatch-20&l=as2&o=1&a=1449399029" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important; height: 1px;" />
-                  <div class="btn-group"><a class="btn btn-info" onClick="_gaq.push(['_trackEvent', 'refs', 'amazon', 'javascriptandjquery']);" href="http://www.amazon.com/gp/product/1449399029/ref=as_li_tf_tl?ie=UTF8&tag=bootswatch-20&linkCode=as2&camp=1789&creative=9325&creativeASIN=1449399029" target="_blank">Amazon</a></div>
+                  <div class="btn-group"><a class="btn btn-info" onClick="_gaq.push(['_trackEvent', 'refs', 'amazon', 'lesscss']);" href="http://www.amazon.com/gp/product/178216376X/ref=as_li_tf_tl?ie=UTF8&tag=bootswatch-20&linkCode=as2&camp=1789&creative=9325&creativeASIN=178216376X" target="_blank">Amazon</a></div>
                 </div>
               </div>
             </div>