MLA

Toomer, Jean, 1894-1967. Johnson, Kitty. Box 4, folder 120. 1923-24. https://collections.library.yale.edu/catalog/16725491.

APA, 6th edition

Toomer, Jean, 1894-1967. (["Box 4, folder 120"])(1923-24)[Johnson, Kitty]. https://collections.library.yale.edu/catalog/16725491.