Cita APA (7th ed.)
O'Brien, J. A. (1994). Introduction to information systems (7th ed.). Irwin.
Cita Chicago (17th ed.)
O'Brien, James A. Introduction to Information Systems. 7th ed. Burr Ridge, Ill.: Irwin, 1994.
Cita MLA (9th ed.)
O'Brien, James A. Introduction to Information Systems. 7th ed. Irwin, 1994.
Atenció: Aquestes cites poden no estar 100% correctes.