MLA

Hughes, Langston, 1902-1967. Allen, Betty. Box 19, folder 227-229. 1965. https://collections.library.yale.edu/catalog/16207010.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 19, folder 227-229"])(1965)[Allen, Betty]. https://collections.library.yale.edu/catalog/16207010.