MLA

Oenslager, Donald, 1902-1975. Photographs. Box 6, folder 188. 1890-1949, n.d.. https://collections.library.yale.edu/catalog/2054860.

APA, 6th edition

Oenslager, Donald, 1902-1975. (["Box 6, folder 188"])(1890-1949, n.d.)[Photographs]. https://collections.library.yale.edu/catalog/2054860.