MLA

Hughes, Langston, 1902-1967. Music sheets. Box 367, folder 5929. n.d.. https://collections.library.yale.edu/catalog/17288854.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 367, folder 5929"])(n.d.)[Music sheets]. https://collections.library.yale.edu/catalog/17288854.