APA-referens (7:e uppl.)

Clark, C. (1960). The conditions of economic progress (3th.ed.). Garland Pub..

Chicago-referens (17:e uppl.)

Clark, Colin. The Conditions of Economic Progress. 3th.ed. New York: Garland Pub., 1960.

MLA-referens (9:e uppl.)

Clark, Colin. The Conditions of Economic Progress. 3th.ed. Garland Pub., 1960.