MLA

Wharton, Edith, 1862-1937. Edith Wharton. Box 53, folder 1571-88. c. 1868-1930. https://collections.library.yale.edu/catalog/32193437.

APA, 6th edition

Wharton, Edith, 1862-1937. (["Box 53, folder 1571-88"])(c. 1868-1930)[Edith Wharton]. https://collections.library.yale.edu/catalog/32193437.