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Lua i Stíl Chicago (17ú heag.)GRANT, Eugene L., W.Grant IRESON, agus Richard S. LEAVENWORTH. Principles of Engineering Economy.-- Ed.8. New York: John Wiley and Sons, 1990.
Lua MLA (9ú heag.)GRANT, Eugene L., et al. Principles of Engineering Economy.-- Ed.8. John Wiley and Sons, 1990.
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