O'Brien, J. A. (1997). Introduction to information systems: Essentials for the Internetworked E-Business Enterprise (8thth ed.). McGraw Hill - Irwin.
Chicago-čujuhus (17. p.)O'Brien, James A. Introduction to Information Systems: Essentials for the Internetworked E-Business Enterprise. 8thth ed. Boston: McGraw Hill - Irwin, 1997.
MLA-čujuhus (9. p.)O'Brien, James A. Introduction to Information Systems: Essentials for the Internetworked E-Business Enterprise. 8thth ed. McGraw Hill - Irwin, 1997.
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