MLA

Wharton, Edith, 1862-1937. Lubbock, Percy. Box 58, folder 1686-1700. 1912-33. https://collections.library.yale.edu/catalog/2044130.

APA, 6th edition

Wharton, Edith, 1862-1937. (["Box 58, folder 1686-1700"])(1912-33)[Lubbock, Percy]. https://collections.library.yale.edu/catalog/2044130.