MLA

Wharton, Edith, 1862-1937. "Treasure". Box 63, folder 1784. n.d.. https://collections.library.yale.edu/catalog/17111192.

APA, 6th edition

Wharton, Edith, 1862-1937. (["Box 63, folder 1784"])(n.d.)["Treasure"]. https://collections.library.yale.edu/catalog/17111192.