Walnum, Clayton. SAMS teach yourself game programming with DirectX in 21 days / Teach yourself game programming with DirectX in 21 days Clayton Walnum. - Indianapolis, Ind. : Sams, c2003. - xvii, 701 p. : ill. ; 23 cm. + 1 CD-ROM (4 3/4 in.) Includes index. ISBN: 0672324199 Subjects--Uniform Titles: DirectX. Subjects--Topical Terms: Computer games--Programming. Dewey Class. No.: 794.815133 / WAL