MLA

Hughes, Langston, 1902-1967. Harper, Toy. Box 267, folder 4400. 1936-63, n.d.. https://collections.library.yale.edu/catalog/17034019.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 267, folder 4400"])(1936-63, n.d.)[Harper, Toy]. https://collections.library.yale.edu/catalog/17034019.