Interesting code to read
silentbicycle: For C, the Lua source is great, and there's a hyperlinked version here - http://www.lua.org/source/5.1/ . It's written in strictly compliant ANSI C.For Lisp and Scheme, try Peter Norvig's _Paradigms of Artificial Intelligence Programming_ and Christian Queinnec's _Lisp in Small Pieces_ (PAIP and LiSP). The former has more Common Lisp, the latter Scheme. Both will give you quite a bit to think about. :)