Cita APA (7th ed.)
O'Brien, J. A. (2003). Introduction to information systems: Essentials for the E-business enterprise (11th ed.). McGraw-Hill/Irwin.
Cita Chicago (17th ed.)
O'Brien, James A. Introduction to Information Systems: Essentials for the E-business Enterprise. 11th ed. Boston: McGraw-Hill/Irwin, 2003.
Cita MLA (9th ed.)
O'Brien, James A. Introduction to Information Systems: Essentials for the E-business Enterprise. 11th ed. McGraw-Hill/Irwin, 2003.
Atenció: Aquestes cites poden no estar 100% correctes.