APA (7th ed.) Citation

Slagell, M. (2002). Sams teach yourself Ruby in 21 days. Sams.

Chicago Style (17th ed.) Citation

Slagell, Mark. Sams Teach Yourself Ruby in 21 Days. Indianapolis, Ind.: Sams, 2002.

MLA (8th ed.) Citation

Slagell, Mark. Sams Teach Yourself Ruby in 21 Days. Sams, 2002.

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