MLA

Wharton, Edith, 1862-1937. Synopsis. Box 15, folder 425. n.d.. https://collections.library.yale.edu/catalog/17111105.

APA, 6th edition

Wharton, Edith, 1862-1937. (["Box 15, folder 425"])(n.d.)[Synopsis]. https://collections.library.yale.edu/catalog/17111105.