Hoffer, J., & George, J. F. &. V. (2011). Modern Systems Analysis and Design (6th ed.). Pearson.
Lua i Stíl Chicago (17ú heag.)Hoffer, Jeffrey, agus Joey F. & Valacich George. Modern Systems Analysis and Design. 6th ed. Boston: Pearson, 2011.
Lua MLA (9ú heag.)Hoffer, Jeffrey, agus Joey F. & Valacich George. Modern Systems Analysis and Design. 6th ed. Pearson, 2011.
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