MLA

Hughes, Langston, 1902-1967. Demby, William. Box 60. circa 1920-1993. https://collections.library.yale.edu/catalog/17028495.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 60"])(circa 1920-1993)[Demby, William]. https://collections.library.yale.edu/catalog/17028495.