Upton, D. M. (1998). Designing managing, and improving operations. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Upton, David M. Designing Managing, and Improving Operations. Upper Saddle River, N.J: Prentice-Hall, 1998.
Lua MLA (9ú heag.)Upton, David M. Designing Managing, and Improving Operations. Prentice-Hall, 1998.
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