MLA

Toomer, Jean, 1894-1967. "O Clouds Roll Back": typescript. Box 67, folder 1524. n.d.. https://collections.library.yale.edu/catalog/16725557.

APA, 6th edition

Toomer, Jean, 1894-1967. (["Box 67, folder 1524"])(n.d.)["O Clouds Roll Back": typescript]. https://collections.library.yale.edu/catalog/16725557.