MLA

Toomer, Jean, 1894-1967. Lectures: notes & publicity. Box 68, folder 1540. 1930-39. https://collections.library.yale.edu/catalog/16725562.

APA, 6th edition

Toomer, Jean, 1894-1967. (["Box 68, folder 1540"])(1930-39)[Lectures: notes & publicity]. https://collections.library.yale.edu/catalog/16725562.