Optner, S. L. (1968). Systems analysis for business management. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Optner, Stanford L. Systems Analysis for Business Management. Englewood Cliffs, NJ: Prentice-Hall, 1968.
Lua MLA (9ú heag.)Optner, Stanford L. Systems Analysis for Business Management. Prentice-Hall, 1968.
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