MLA

Hughes, Langston, 1902-1967. Tynes, Margaret. Box 21, folder 315. 1875-1978. https://collections.library.yale.edu/catalog/16207092.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 21, folder 315"])(1875-1978)[Tynes, Margaret]. https://collections.library.yale.edu/catalog/16207092.