Cita APA (7th ed.)

Perry, G. (1998). Sams teach yourself: Visual basic 6 in 21 days. Techmedia.

Cita Chicago (17th ed.)

Perry, Greg. Sams Teach Yourself: Visual Basic 6 in 21 Days. New Delhi: Techmedia, 1998.

Cita MLA (9th ed.)

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