Cita APA (7a ed.)

Friedberg, R., & Friedberg, J. (1971). Gold coins of the world, complete from 600 A.D. to the present: An illustrated standard catalogue with valuations (3rd ed.). The Coin and Currency Institute.

Cita Chicago Style (17a ed.)

Friedberg, Robert, y Jack Friedberg. Gold Coins of the World, Complete from 600 A.D. to the Present: An Illustrated Standard Catalogue with Valuations. 3rd ed. New York: The Coin and Currency Institute, 1971.

Cita MLA (9a ed.)

Friedberg, Robert, y Jack Friedberg. Gold Coins of the World, Complete from 600 A.D. to the Present: An Illustrated Standard Catalogue with Valuations. 3rd ed. The Coin and Currency Institute, 1971.