MLA

Wharton, Edith, 1862-1937. Notes. Box 10, folder 269. n.d.. https://collections.library.yale.edu/catalog/17111096.

APA, 6th edition

Wharton, Edith, 1862-1937. (["Box 10, folder 269"])(n.d.)[Notes]. https://collections.library.yale.edu/catalog/17111096.