APA-referens (7:e uppl.)

Clark, C. (1957). The conditions of economic progress (3rd ed.). New York: St. Martins Pr..

Chicago-referens (17:e uppl.)

Clark, Colin. The Conditions of Economic Progress. 3rd ed. London: Macmillan: New York: St. Martins Pr., 1957.

MLA-referens (9:e uppl.)

Clark, Colin. The Conditions of Economic Progress. 3rd ed. New York: St. Martins Pr., 1957.