MLA

Toomer, Jean, 1894-1967. Notes. Box 44, folder 913. n.d.. https://collections.library.yale.edu/catalog/16725525.

APA, 6th edition

Toomer, Jean, 1894-1967. (["Box 44, folder 913"])(n.d.)[Notes]. https://collections.library.yale.edu/catalog/16725525.