MLA

Hughes, Langston, 1902-1967. Notebook. Box 511, folder 12685. ca. 1919. https://collections.library.yale.edu/catalog/16808304.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 511, folder 12685"])(ca. 1919)[Notebook]. https://collections.library.yale.edu/catalog/16808304.