MLA

Hughes, Langston, 1902-1967. Academy of American Poets. Box 2, folder 22. 1966-1967. https://collections.library.yale.edu/catalog/32604239.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 2, folder 22"])(1966-1967)[Academy of American Poets]. https://collections.library.yale.edu/catalog/32604239.