Whitten, J. L., Bentley, L. D., & Barlow, V. M. (1989). Systems analysis & design methods (2nd ed.). Irwin.
Lua i Stíl Chicago (17ú heag.)Whitten, Jeffrey L., Lonnie D. Bentley, agus Victor M. Barlow. Systems Analysis & Design Methods. 2nd ed. Homewood, Ill: Irwin, 1989.
Lua MLA (9ú heag.)Whitten, Jeffrey L., et al. Systems Analysis & Design Methods. 2nd ed. Irwin, 1989.
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