Cita APA (7a ed.)

Angell, N. (1940). Economic principles and problems (4th ed.). Rinehart & Company.

Cita Chicago Style (17a ed.)

Angell, Norman. Economic Principles and Problems. 4th ed. New York: Rinehart & Company, 1940.

Cita MLA (9a ed.)

Angell, Norman. Economic Principles and Problems. 4th ed. Rinehart & Company, 1940.