Merge pull request #1581 from borgified/fix_1192

fixes #1192

free-programming-books.md

@@ -636,6 +636,7 @@ Original Source: [Free Programming books](http://stackoverflow.com/revisions/392
 * [Programming Languages: Application and Interpretation (2nd Edition)](http://www.cs.brown.edu/~sk/Publications/Books/ProgLangs/)
 * [Semantics with Applications: A Formal Introduction](http://www.daimi.au.dk/~bra8130/Wiley_book/wiley.html) - Hanne Riis Nielson, Flemming Nielson
 * [Structure and Interpretation of Computer Programs](http://mitpress.mit.edu/sicp/)
+* [Structure and Interpretation of Computer Programs](http://sarabander.github.io/sicp/html/index.xhtml)
 * [Theory of Computation](http://www.cse.iitd.ernet.in/~ssen/csl705/admin705.html) - Sandeep Sen, IIT Delhi
 * [Think Complexity](http://www.greenteapress.com/compmod/) - Allen B. Downey