racket guide

free-programming-books.md

@@ -641,6 +641,7 @@
 
 ###Racket
 * [Programming Languages: Application and Interpretation](http://cs.brown.edu/courses/cs173/2012/book/index.html)
+* [The Racket Guide](http://docs.racket-lang.org/guide/index.html)
 
 
 ###Ruby