Cita APA (7th ed.)
Perry, G. M. (1998). Sams teach yourself Visual Basic 6 in 21 days. G.C Jain.
Cita Chicago (17th ed.)
Perry, Greg M. Sams Teach Yourself Visual Basic 6 in 21 Days. New Delhi.: G.C Jain, 1998.
Cita MLA (9th ed.)
Perry, Greg M. Sams Teach Yourself Visual Basic 6 in 21 Days. G.C Jain, 1998.
Atenció: Aquestes cites poden no estar 100% correctes.