DeGARMO, E. P., SULLIVAN, W. G., & BONTADELLI, J. A. (1989). Engineering economy. -- 8th ed. Macmillan.
Lua i Stíl Chicago (17ú heag.)DeGARMO, E. Paul, William G. SULLIVAN, agus James A. BONTADELLI. Engineering Economy. -- 8th Ed. New York: Macmillan, 1989.
Lua MLA (9ú heag.)DeGARMO, E. Paul, et al. Engineering Economy. -- 8th Ed. Macmillan, 1989.
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