Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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