APA (7th ed.) Citation

Walnum, C. (2003). Sams teach yourself game programming with DirectX in 21 days. Sams.

Chicago Style (17th ed.) Citation

Walnum, Clayton. Sams Teach Yourself Game Programming with DirectX in 21 Days. Indianapolis, Ind.: Sams, 2003.

MLA (9th ed.) Citation

Walnum, Clayton. Sams Teach Yourself Game Programming with DirectX in 21 Days. Sams, 2003.

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