MLA

Wharton, Edith, 1862-1937. Notes. Box 14, folder 390. n.d.. https://collections.library.yale.edu/catalog/17111100.

APA, 6th edition

Wharton, Edith, 1862-1937. (["Box 14, folder 390"])(n.d.)[Notes]. https://collections.library.yale.edu/catalog/17111100.