MLA

Hughes, Langston, 1902-1967. Monosiet, Pierre. Box 19, folder 249. 1875-1978. https://collections.library.yale.edu/catalog/16207031.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 19, folder 249"])(1875-1978)[Monosiet, Pierre]. https://collections.library.yale.edu/catalog/16207031.