MLA

Wilson, Edmund, 1895-1972. Unidentified, in brown clothes. Box 204, folder 5008. n.d.. https://collections.library.yale.edu/catalog/2005089.

APA, 6th edition

Wilson, Edmund, 1895-1972. (["Box 204, folder 5008"])(n.d.)[Unidentified, in brown clothes]. https://collections.library.yale.edu/catalog/2005089.