【関連サイト: Ruby編】

・Functional programming with Ruby
　http://www.slideshare.net/tokland/functional-programming-with-ruby-9975242
　http://code.google.com/p/tokland/wiki/RubyFunctionalProgramming

・Thinking Functionally In Ruby – A Great Presentation by Tom Stuart
　http://www.rubyinside.com/functional-programming-in-ruby-2713.html

・Functional Programming Techniques With Ruby: Part I & Part II
　http://rubysource.com/tag/functional-programming/

・Adventures in Functional Programming With Ruby
　http://www.naildrivin5.com/blog/2012/07/17/adventures-in-functional-programming-with-ruby.html