References
Shortened URLs are numbered sequentially; the related long URLs are listed below for reference.
Chapter 1
2 http://c2.com/cgi/wiki?DontRepeatYourself
3 http://www.w3.org/People/Bos/DesignGuide/maintainability.html
4 http://sass-lang.com/about.html
Chapter 2
6 http://mhs.github.com/scout-app/
7 http://incident57.com/codekit
11 http://www.w3.org/TR/css-variables/
Chapter 4
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