MLA

Hughes, Langston, 1902-1967. Davis, Jimmy. Box 52, folder 975-978. 1942-67, n.d.. https://collections.library.yale.edu/catalog/16998751.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 52, folder 975-978"])(1942-67, n.d.)[Davis, Jimmy]. https://collections.library.yale.edu/catalog/16998751.