Photographs
MLA
Cassirer, Ernst, 1874-1945. Photographs. Box 13, folder 231. 1921, n.d.. https://collections.library.yale.edu/catalog/16696809.
APA, 6th edition
Cassirer, Ernst, 1874-1945. (["Box 13, folder 231"])(1921, n.d.)[Photographs]. https://collections.library.yale.edu/catalog/16696809.