MLA

Wharton, Edith, 1862-1937. Farrand, Beatrix Jones. Box 25, folder 759-66. 1912-37. https://collections.library.yale.edu/catalog/16724398.

APA, 6th edition

Wharton, Edith, 1862-1937. (["Box 25, folder 759-66"])(1912-37)[Farrand, Beatrix Jones]. https://collections.library.yale.edu/catalog/16724398.