MLA

Wharton, Edith, 1862-1937. Correction sheet. Box 2, folder 45. n.d.. https://collections.library.yale.edu/catalog/17111083.

APA, 6th edition

Wharton, Edith, 1862-1937. (["Box 2, folder 45"])(n.d.)[Correction sheet]. https://collections.library.yale.edu/catalog/17111083.