APA (7th ed.) Citation

Perry, G. M. (1999). Sams teach yourself Visual Basic 6 in 21 days (Professional reference ed.). Macmillan Computer Pub..

Chicago Style (17th ed.) Citation

Perry, Greg M. Sams Teach Yourself Visual Basic 6 in 21 Days. Professional reference ed. Indianapolis, IN: Macmillan Computer Pub., 1999.

MLA (9th ed.) Citation

Perry, Greg M. Sams Teach Yourself Visual Basic 6 in 21 Days. Professional reference ed. Macmillan Computer Pub., 1999.