Cita APA (7th ed.)
O'Brien, J. A. (2005). Introduction to information systems (12th ed.). McGraw Hill.
Cita Chicago (17th ed.)
O'Brien, James A. Introduction to Information Systems. 12th ed. Boston: McGraw Hill, 2005.
Cita MLA (9th ed.)
O'Brien, James A. Introduction to Information Systems. 12th ed. McGraw Hill, 2005.
Atenció: Aquestes cites poden no estar 100% correctes.