Sort scheme

free-programming-books.md

@@ -1483,13 +1483,13 @@ See also [TeX](#tex)
 
 
 ###Scheme
+* [An Introduction to Scheme and its Implementation](ftp://ftp.cs.utexas.edu/pub/garbage/cs345/schintro-v14/schintro_toc.html)
 * [Concrete Abstractions: An Introduction to Computer Science Using Scheme](https://gustavus.edu/+max/concrete-abstractions.html)
 * [How to Design Programs](http://htdp.org)
-* [Structure and Interpretion of Computer Programs](http://mitpress.mit.edu/sicp/full-text/book/book.html)
-* The Scheme Programming Language [Edition 3](http://www.scheme.com/tspl3/), [Edition 4](http://www.scheme.com/tspl4/)
 * [Simply Scheme: Introducing Computer Science](http://www.cs.berkeley.edu/~bh/ss-toc2.html)
+* [Structure and Interpretion of Computer Programs](http://mitpress.mit.edu/sicp/full-text/book/book.html)
 * [Teach Yourself Scheme in Fixnum Days](http://www.ccs.neu.edu/home/dorai/t-y-scheme/t-y-scheme.html)
-* [An Introduction to Scheme and its Implementation](ftp://ftp.cs.utexas.edu/pub/garbage/cs345/schintro-v14/schintro_toc.html)
+* The Scheme Programming Language [Edition 3](http://www.scheme.com/tspl3/), [Edition 4](http://www.scheme.com/tspl4/)
 
 
 ###Scilab