MLA

Hughes, Langston, 1902-1967. Hampton, Lionel. Box 20, folder 260. 1975. https://collections.library.yale.edu/catalog/16207041.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 20, folder 260"])(1975)[Hampton, Lionel]. https://collections.library.yale.edu/catalog/16207041.