MLA

Toomer, Jean, 1894-1967. Dust jacket. Box 26, folder 609. n.d.. https://collections.library.yale.edu/catalog/2022948.

APA, 6th edition

Toomer, Jean, 1894-1967. (["Box 26, folder 609"])(n.d.)[Dust jacket]. https://collections.library.yale.edu/catalog/2022948.