MLA

Hughes, Langston, 1902-1967. Toomer, Jean. Box 155, folder 2883. 1933 Nov 28. https://collections.library.yale.edu/catalog/17020477.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 155, folder 2883"])(1933 Nov 28)[Toomer, Jean]. https://collections.library.yale.edu/catalog/17020477.