MLA

Hughes, Langston, 1902-1967. Mphahlele, Ezekiel. Box 114, folder 2185. 1954-66, n.d.. https://collections.library.yale.edu/catalog/2053584.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 114, folder 2185"])(1954-66, n.d.)[Mphahlele, Ezekiel]. https://collections.library.yale.edu/catalog/2053584.