MLA

Toomer, Jean, 1894-1967. Dupee, Helen. Box 2, folder 63. 1935. https://collections.library.yale.edu/catalog/16725475.

APA, 6th edition

Toomer, Jean, 1894-1967. (["Box 2, folder 63"])(1935)[Dupee, Helen]. https://collections.library.yale.edu/catalog/16725475.