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.