MLA

Wharton, Edith, 1862-1937. "Penelope". Box 63, folder 1783. n.d.. https://collections.library.yale.edu/catalog/17111191.

APA, 6th edition

Wharton, Edith, 1862-1937. (["Box 63, folder 1783"])(n.d.)["Penelope"]. https://collections.library.yale.edu/catalog/17111191.