APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

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

MLA-referens (9:e uppl.)

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