Lua APA (7ú heag.)

DeGarmo,E.Paul. (1979). Engineering economy (6th.ed.). Macmillan.

Lua i Stíl Chicago (17ú heag.)

DeGarmo,E.Paul. Engineering Economy. 6th.ed. New York: Macmillan, 1979.

Lua MLA (9ú heag.)

DeGarmo,E.Paul. Engineering Economy. 6th.ed. Macmillan, 1979.

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