MLA

Hughes, Langston, 1902-1967. African-American Youth. Box 224. circa 1920-1993. https://collections.library.yale.edu/catalog/17399999.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 224"])(circa 1920-1993)[African-American Youth]. https://collections.library.yale.edu/catalog/17399999.