MLA

Wilson, Edmund, 1895-1972. Three unidentified men, tintype. Box 201, folder 4935. n.d.. https://collections.library.yale.edu/catalog/2005063.

APA, 6th edition

Wilson, Edmund, 1895-1972. (["Box 201, folder 4935"])(n.d.)[Three unidentified men, tintype]. https://collections.library.yale.edu/catalog/2005063.