MLA

Wharton, Edith, 1862-1937. Untitled poems: holograph manuscripts. Box 21, folder 689-92. n.d.. https://collections.library.yale.edu/catalog/17111144.

APA, 6th edition

Wharton, Edith, 1862-1937. (["Box 21, folder 689-92"])(n.d.)[Untitled poems: holograph manuscripts]. https://collections.library.yale.edu/catalog/17111144.