MLA

Hughes, Langston, 1902-1967. The Troubadours. Box 11 (Oversize), folder 129. 1893-1954. https://collections.library.yale.edu/catalog/16206929.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 11 (Oversize), folder 129"])(1893-1954)[The Troubadours]. https://collections.library.yale.edu/catalog/16206929.