Working notes
MLA
Hughes, Langston, 1902-1967. Working notes. Box 337, folder 5498. 1939, n.d.. https://collections.library.yale.edu/catalog/31919010.
APA, 6th edition
Hughes, Langston, 1902-1967. (["Box 337, folder 5498"])(1939, n.d.)[Working notes]. https://collections.library.yale.edu/catalog/31919010.