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. USA: Techmedia, 1998.

Cita MLA (9th ed.)

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