Cita APA (7th ed.)

O'Brien, J. A. (1997). Introduction to information systems (8th ed.). Irwin.

Cita Chicago (17th ed.)

O'Brien, James A. Introduction to Information Systems. 8th ed. Boston ; Chicago: Irwin, 1997.

Cita MLA (8th ed.)

O'Brien, James A. Introduction to Information Systems. 8th ed. Irwin, 1997.