Lua APA (7ú heag.)
O'Brien, J. A. (2005). Introduction to information systems (12th ed.). McGraw Hill.
Lua i Stíl Chicago (17ú heag.)
O'Brien, James A. Introduction to Information Systems. 12th ed. Boston: McGraw Hill, 2005.
Lua MLA (9ú heag.)
O'Brien, James A. Introduction to Information Systems. 12th ed. McGraw Hill, 2005.
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