APA
Walnum C., . (2003). Sams Teach Yourself Game Programming with DirectX in 21 Days. : Sams Publishing.
Chicago
Walnum Clayton, . 2003. Sams Teach Yourself Game Programming with DirectX in 21 Days. : Sams Publishing.
Harvard
Walnum C., . (2003). Sams Teach Yourself Game Programming with DirectX in 21 Days. : Sams Publishing.
MLA
Walnum Clayton, . Sams Teach Yourself Game Programming with DirectX in 21 Days. : Sams Publishing. 2003.