MLA

Toomer, Jean, 1894-1967. "Spring": typescript. Box 67, folder 1530. n.d.. https://collections.library.yale.edu/catalog/16725559.

APA, 6th edition

Toomer, Jean, 1894-1967. (["Box 67, folder 1530"])(n.d.)["Spring": typescript]. https://collections.library.yale.edu/catalog/16725559.