MLA

Hughes, Langston, 1902-1967. Steinberg, Benjamin. Box 22, folder 350. 1875-1978. https://collections.library.yale.edu/catalog/16207123.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 22, folder 350"])(1875-1978)[Steinberg, Benjamin]. https://collections.library.yale.edu/catalog/16207123.