MLA

Hughes, Langston, 1902-1967. Castillo, R.. Box 19, folder 244. 1875-1978. https://collections.library.yale.edu/catalog/16207025.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 19, folder 244"])(1875-1978)[Castillo, R.]. https://collections.library.yale.edu/catalog/16207025.