MLA

Toomer, Jean, 1894-1967. "Y" general. Box 9, folder 285. 1937-47. https://collections.library.yale.edu/catalog/2036586.

APA, 6th edition

Toomer, Jean, 1894-1967. (["Box 9, folder 285"])(1937-47)["Y" general]. https://collections.library.yale.edu/catalog/2036586.