DeGarmo, E. P. (1997). Engineering economy (10th ed.). Prentice Hall.
Lua i Stíl Chicago (17ú heag.)DeGarmo, Ernest Paul. Engineering Economy. 10th ed. Upper Saddle River, NJ: Prentice Hall, 1997.
Lua MLA (9ú heag.)DeGarmo, Ernest Paul. Engineering Economy. 10th ed. Prentice Hall, 1997.
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