Whitten, J. L. (1994). Systems analysis & design methods (3rd.ed.). Irwin.
Chicago-čujuhus (17. p.)Whitten, Jeffrey L. Systems Analysis & Design Methods. 3rd.ed. Burr Ridge: Irwin, 1994.
MLA-čujuhus (9. p.)Whitten, Jeffrey L. Systems Analysis & Design Methods. 3rd.ed. Irwin, 1994.
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