LEE, B. (1982). Introducing Systems Analysis And Design Vol. 2 Barry Lee. John Wile & Sons.
Lua i Stíl Chicago (17ú heag.)LEE, Barry. Introducing Systems Analysis And Design Vol. 2 Barry Lee. John Wile & Sons, 1982.
Lua MLA (8ú heag.)LEE, Barry. Introducing Systems Analysis And Design Vol. 2 Barry Lee. John Wile & Sons, 1982.
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