MLA

Toomer, Jean, 1894-1967. Certificates and diplomas. Box 60, folder 1404. 1917-31. https://collections.library.yale.edu/catalog/11061553.

APA, 6th edition

Toomer, Jean, 1894-1967. (["Box 60, folder 1404"])(1917-31)[Certificates and diplomas]. https://collections.library.yale.edu/catalog/11061553.