MLA

Hughes, Langston, 1902-1967. Karamu Artist Exhibition. Box 7 (Oversize), folder 79. 1942 January. https://collections.library.yale.edu/catalog/16198527.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 7 (Oversize), folder 79"])(1942 January)[Karamu Artist Exhibition]. https://collections.library.yale.edu/catalog/16198527.