MLA

Wharton, Edith, 1862-1937. Doyle, Hannah. Box 54, folder 1606. n.d.. https://collections.library.yale.edu/catalog/16793509.

APA, 6th edition

Wharton, Edith, 1862-1937. (["Box 54, folder 1606"])(n.d.)[Doyle, Hannah]. https://collections.library.yale.edu/catalog/16793509.