MLA

Hughes, Langston, 1902-1967. Unidentified. Box 17, folder 220. 1875-1978. https://collections.library.yale.edu/catalog/16847721.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 17, folder 220"])(1875-1978)[Unidentified]. https://collections.library.yale.edu/catalog/16847721.