Gemar-Koeltzsch, E., & Heibel, Y. F. (1998). German marks: Postwar drawings and prints donated to the Busch-Reisinger Museum through the German Art Dealers Association.
Chicago-referens (17:e uppl.)Gemar-Koeltzsch, Erika, och Yule F. Heibel. German Marks: Postwar Drawings and Prints Donated to the Busch-Reisinger Museum Through the German Art Dealers Association. Cambridge, Massachusetts, 1998.
MLA-referens (8:e uppl.)Gemar-Koeltzsch, Erika, och Yule F. Heibel. German Marks: Postwar Drawings and Prints Donated to the Busch-Reisinger Museum Through the German Art Dealers Association. 1998.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.