O'Brien, J. A. (2004). Management information systems: Managing information technology in the business enterprise (6th ed.). Tata McGraw-Hill/Irwin.

O'Brien, James A. Management Information Systems: Managing Information Technology in the Business Enterprise. 6th ed. Boston ; New Delhi: Tata McGraw-Hill/Irwin, 2004.

O'Brien, James A. Management Information Systems: Managing Information Technology in the Business Enterprise. 6th ed. Tata McGraw-Hill/Irwin, 2004.