Marakas, G. M. (2006). Systems Analysis & Designan active approachGeorge M. Marakas. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Marakas, George M. Systems Analysis & Designan Active ApproachGeorge M. Marakas. McGraw-Hill, 2006.
Lua MLA (8ú heag.)Marakas, George M. Systems Analysis & Designan Active ApproachGeorge M. Marakas. McGraw-Hill, 2006.
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