APA (7th ed.) Citation

Conley, J. D. (1998). Object-oriented programming with visual basic in 21 days. Sams Publishers.

Chicago Style (17th ed.) Citation

Conley, John D. Object-oriented Programming with Visual Basic in 21 Days. United States: Sams Publishers, 1998.

MLA (9th ed.) Citation

Conley, John D. Object-oriented Programming with Visual Basic in 21 Days. Sams Publishers, 1998.