MLA

Wharton, Edith, 1862-1937. Letters. Box 65, folder 1793-95. 1925-38. https://collections.library.yale.edu/catalog/2013856.

APA, 6th edition

Wharton, Edith, 1862-1937. (["Box 65, folder 1793-95"])(1925-38)[Letters]. https://collections.library.yale.edu/catalog/2013856.