MLA

Hughes, Langston, 1902-1967. Negro Radio Workshop. Box 119, folder 2258. 1941. https://collections.library.yale.edu/catalog/32417907.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 119, folder 2258"])(1941)[Negro Radio Workshop]. https://collections.library.yale.edu/catalog/32417907.