MLA

Toomer, Jean, 1894-1967. Dupee, Pauline. Box 2, folder 65. 1931-58, n.d.. https://collections.library.yale.edu/catalog/16725477.

APA, 6th edition

Toomer, Jean, 1894-1967. (["Box 2, folder 65"])(1931-58, n.d.)[Dupee, Pauline]. https://collections.library.yale.edu/catalog/16725477.