MLA

Hughes, Langston, 1902-1967. Newport Jazz Festival: program. Box 482, folder 12183. 1960 Jul 3. https://collections.library.yale.edu/catalog/17394802.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 482, folder 12183"])(1960 Jul 3)[Newport Jazz Festival: program]. https://collections.library.yale.edu/catalog/17394802.