APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

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

MLA-referens (8:e uppl.)

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