APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (8th ed.) Citation

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

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