Braam, F. A. v. (1950). World collectors annuary.
Cita Chicago (17th ed.)Braam, Fred A. von. World Collectors Annuary. 1950.
Cita MLA (8th ed.)Braam, Fred A. von. World Collectors Annuary. 1950.
Atenció: Aquestes cites poden no estar 100% correctes.