MLA

Hughes, Langston, 1902-1967. Rive, Richard. Box 137, folder 2553. 1954-66, n.d.. https://collections.library.yale.edu/catalog/2017253.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 137, folder 2553"])(1954-66, n.d.)[Rive, Richard]. https://collections.library.yale.edu/catalog/2017253.