APA (7th ed.) Citation

Gutschmidt. (2004). Game programming with Python, Lua, and Ruby. Premier Press.

Chicago Style (17th ed.) Citation

Gutschmidt. Game Programming with Python, Lua, and Ruby. Boston,MA: Premier Press, 2004.

MLA (8th ed.) Citation

Gutschmidt. Game Programming with Python, Lua, and Ruby. Premier Press, 2004.

Warning: These citations may not always be 100% accurate.