MLA

Sergeant, Elizabeth Shepley, 1881-1965. Photographs. Box 19, folder 411. n.d.. https://collections.library.yale.edu/catalog/9998338.

APA, 6th edition

Sergeant, Elizabeth Shepley, 1881-1965. (["Box 19, folder 411"])(n.d.)[Photographs]. https://collections.library.yale.edu/catalog/9998338.