MLA

Wharton, Edith, 1862-1937. Correspondence. Box 40, folder 1211. 1916. https://collections.library.yale.edu/catalog/17401370.

APA, 6th edition

Wharton, Edith, 1862-1937. (["Box 40, folder 1211"])(1916)[Correspondence]. https://collections.library.yale.edu/catalog/17401370.