Friedberg, R., & Friedberg, J. (1971). Gold coins of the world, complete from 600 A.D. to the present: An illustrated standard catalogue with valuations (3d ed.). Coin and Currency Institute.
Chicago Style (17th ed.) CitationFriedberg, Robert, and Jack Friedberg. Gold Coins of the World, Complete from 600 A.D. to the Present: An Illustrated Standard Catalogue with Valuations. 3d ed. New York: Coin and Currency Institute, 1971.
MLA (9th ed.) CitationFriedberg, Robert, and Jack Friedberg. Gold Coins of the World, Complete from 600 A.D. to the Present: An Illustrated Standard Catalogue with Valuations. 3d ed. Coin and Currency Institute, 1971.
Warning: These citations may not always be 100% accurate.