Tohutoro APA (7th ed.)

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

Tohutoru Kātū Chicago (17th ed.)

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

Tohutoro MLA (9th ed.)

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