MLA

Toomer, Jean, 1894-1967. Holograph. Box 44, folder 914-16. n.d.. https://collections.library.yale.edu/catalog/16725526.

APA, 6th edition

Toomer, Jean, 1894-1967. (["Box 44, folder 914-16"])(n.d.)[Holograph]. https://collections.library.yale.edu/catalog/16725526.