Research materials
MLA
Hughes, Langston, 1902-1967. Research materials. Box 367, folder 5914. 1939, n.d.. https://collections.library.yale.edu/catalog/17034072.
APA, 6th edition
Hughes, Langston, 1902-1967. (["Box 367, folder 5914"])(1939, n.d.)[Research materials]. https://collections.library.yale.edu/catalog/17034072.