MLA

Hughes, Langston, 1902-1967. Newport Jazz Festival: note, postcard, passes. Box 481, folder 12117. 1956 Jul 11. https://collections.library.yale.edu/catalog/17394801.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 481, folder 12117"])(1956 Jul 11)[Newport Jazz Festival: note, postcard, passes]. https://collections.library.yale.edu/catalog/17394801.