Cita APA (7a ed.)

O'Brien, J. A. (1994). Introduction to information systems (7th ed.). Irwin.

Cita Chicago Style (17a ed.)

O'Brien, James A. Introduction to Information Systems. 7th ed. Burr Ridge, Ill.: Irwin, 1994.

Cita MLA (8a ed.)

O'Brien, James A. Introduction to Information Systems. 7th ed. Irwin, 1994.