MLA

Hughes, Langston, 1902-1967. [Poem], holograph. Box 444, folder 10428. ca. 1965. https://collections.library.yale.edu/catalog/2040468.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 444, folder 10428"])(ca. 1965)[[Poem], holograph]. https://collections.library.yale.edu/catalog/2040468.