DeGARMO, E., SULLIVAN, W. G., & CANADA, J. R. (1984). Engineering economy.-- ed.7. Macmillan.
Lua i Stíl Chicago (17ú heag.)DeGARMO, E.Paul, William G. SULLIVAN, agus John R. CANADA. Engineering Economy.-- Ed.7. New York: Macmillan, 1984.
Lua MLA (9ú heag.)DeGARMO, E.Paul, et al. Engineering Economy.-- Ed.7. Macmillan, 1984.
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