Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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