APA (7th ed.) Citation

Perry, G. M. (1998). Sams teach yourself Visual Basic 6 in 21 days. Sams.

Chicago Style (17th ed.) Citation

Perry, Greg M. Sams Teach Yourself Visual Basic 6 in 21 Days. Indianapolis, Ind.: Sams, 1998.

MLA (9th ed.) Citation

Perry, Greg M. Sams Teach Yourself Visual Basic 6 in 21 Days. Sams, 1998.