MLA

Hughes, Langston, 1902-1967. Henderson, David. Box 78, folder 1499. 1964-67. https://collections.library.yale.edu/catalog/16998776.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 78, folder 1499"])(1964-67)[Henderson, David]. https://collections.library.yale.edu/catalog/16998776.