How To Design Programs
   Matthias Felleisen, Robert Bruce Findler, Matthew Flatt, Shriram Krishnamurthi; MIT Press, 2002, ISBN 0262062186. Teaches software design via Scheme language. [Online]
   http://www.htdp.org/

Other Scheme Books
   Information, recommendations, descriptions, purchase source, for 8 books. [Schemers Inc.]
   http://www.schemers.com/scm_bks.html

Scheme Implementation Discussion
   By Paul Wilson. Unfinished book, introduces Scheme for programmers, treats implementation strategies. [Online, University of Texas]
   ftp://ftp.cs.utexas.edu/pub/garbage/cs345/schintro-v14/schintro_toc.html