MLA

Hughes, Langston, 1902-1967. Song, draft, holograph. Box 393, folder 7478. n.d.. https://collections.library.yale.edu/catalog/17394776.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 393, folder 7478"])(n.d.)[Song, draft, holograph]. https://collections.library.yale.edu/catalog/17394776.