MLA

Hughes, Langston, 1902-1967. African Forum. Box 3, folder 45. 1965-67. https://collections.library.yale.edu/catalog/32484176.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 3, folder 45"])(1965-67)[African Forum]. https://collections.library.yale.edu/catalog/32484176.