MLA

Toomer, Jean, 1894-1967. National Association for the Advancement of Colored People. Box 6, folder 192. 1923-35. https://collections.library.yale.edu/catalog/16725494.

APA, 6th edition

Toomer, Jean, 1894-1967. (["Box 6, folder 192"])(1923-35)[National Association for the Advancement of Colored People]. https://collections.library.yale.edu/catalog/16725494.