MLA

Hughes, Langston, 1902-1967. Holiday, Billie. Box 20, folder 263. 1875-1978. https://collections.library.yale.edu/catalog/16207044.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 20, folder 263"])(1875-1978)[Holiday, Billie]. https://collections.library.yale.edu/catalog/16207044.