Add ISBN

staging/index.html

@@ -21,7 +21,8 @@
 <h2>Buy a Copy in Print</h2>
 <ul>
 <a href="http://www.amazon.com/gp/product/0262026651/ref=as_li_tf_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0262026651&linkCode=as2&tag=adamchli-20">From Amazon.com</a><img src="http://ir-na.amazon-adsystem.com/e/ir?t=adamchli-20&l=as2&o=1&a=0262026651" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" /><br/>
-<a href="http://mitpress.mit.edu/books/certified-programming-dependent-types">The MIT Press page for the book</a>
+<a href="http://mitpress.mit.edu/books/certified-programming-dependent-types">The MIT Press page for the book</a><br/>
+<b>ISBN:</b> 9780262026659
 </ul>
 </div>