MLA

Wharton, Edith, 1862-1937. "Diagnosis": holograph manuscript, corrected. Box 16, folder 463-64. n.d.. https://collections.library.yale.edu/catalog/32181584.

APA, 6th edition

Wharton, Edith, 1862-1937. (["Box 16, folder 463-64"])(n.d.)["Diagnosis": holograph manuscript, corrected]. https://collections.library.yale.edu/catalog/32181584.