MLA

Wharton, Edith, 1862-1937. Kipling, Rudyard. Box 28, folder 865-66. 1915. https://collections.library.yale.edu/catalog/17111154.

APA, 6th edition

Wharton, Edith, 1862-1937. (["Box 28, folder 865-66"])(1915)[Kipling, Rudyard]. https://collections.library.yale.edu/catalog/17111154.