Cita APA (7th ed.)
Halvorson, M. (2001). Microsoft visual basic 6.0 professional: Step by step. Prentice Hall of India.
Cita Chicago (17th ed.)
Halvorson, Michael. Microsoft Visual Basic 6.0 Professional: Step by Step. New Delhi: Prentice Hall of India, 2001.
Cita MLA (9th ed.)
Halvorson, Michael. Microsoft Visual Basic 6.0 Professional: Step by Step. Prentice Hall of India, 2001.
Atenció: Aquestes cites poden no estar 100% correctes.