APA (7th ed.) Citation
Perry, G. M. (1998). Sams teach yourself Visual Basic 6 in 21 days. G.C Jain.
Chicago Style (17th ed.) Citation
Perry, Greg M. Sams Teach Yourself Visual Basic 6 in 21 Days. New Delhi.: G.C Jain, 1998.
MLA (9th ed.) Citation
Perry, Greg M. Sams Teach Yourself Visual Basic 6 in 21 Days. G.C Jain, 1998.
Warning: These citations may not always be 100% accurate.