MLA

Wharton, Edith, 1862-1937. Holograph manuscript. Box 9, folder 266. n.d.. https://collections.library.yale.edu/catalog/17111095.

APA, 6th edition

Wharton, Edith, 1862-1937. (["Box 9, folder 266"])(n.d.)[Holograph manuscript]. https://collections.library.yale.edu/catalog/17111095.