MLA

Hughes, Langston, 1902-1967. Addison, Wallace. Box 2, folder 36. 1965. https://collections.library.yale.edu/catalog/32604387.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 2, folder 36"])(1965)[Addison, Wallace]. https://collections.library.yale.edu/catalog/32604387.