Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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