APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (8e ed.) Bronvermelding

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