MLA

Wharton, Edith, 1862-1937. Correction sheet. Box 1, folder 15. n.d.. https://collections.library.yale.edu/catalog/16713600.

APA, 6th edition

Wharton, Edith, 1862-1937. (["Box 1, folder 15"])(n.d.)[Correction sheet]. https://collections.library.yale.edu/catalog/16713600.