MLA

Hughes, Langston, 1902-1967. White, Josh. Box 169, folder 3110. 1956 Oct 4. https://collections.library.yale.edu/catalog/17034000.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 169, folder 3110"])(1956 Oct 4)[White, Josh]. https://collections.library.yale.edu/catalog/17034000.