Czaplicka, J. (1990). Envisioning America: Prints, drawings, and photographs by George Grosz and his contemporaries 1915-1933.
Chicago-referens (17:e uppl.)Czaplicka, John. Envisioning America: Prints, Drawings, and Photographs by George Grosz and His Contemporaries 1915-1933. 1990.
MLA-referens (8:e uppl.)Czaplicka, John. Envisioning America: Prints, Drawings, and Photographs by George Grosz and His Contemporaries 1915-1933. 1990.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.