Friedberg, R., Friedberg, A., & Friedberg, I. S. (1992). Gold coins of the world: From ancient times to the present ; an illustrated standard catalogue with valuations (6th edition.). Coin and Currency Institute.
Chicago Style (17th ed.) CitationFriedberg, Robert, Arthur Friedberg, and Ira S. Friedberg. Gold Coins of the World: From Ancient Times to the Present ; an Illustrated Standard Catalogue with Valuations. 6th edition. Clifton, N.J., USA: Coin and Currency Institute, 1992.
MLA (9th ed.) CitationFriedberg, Robert, et al. Gold Coins of the World: From Ancient Times to the Present ; an Illustrated Standard Catalogue with Valuations. 6th edition. Coin and Currency Institute, 1992.
Warning: These citations may not always be 100% accurate.