MLA

Hughes, Langston, 1902-1967. Ovington, Mary White. Box 22, folder 349. 1875-1978. https://collections.library.yale.edu/catalog/16207122.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 22, folder 349"])(1875-1978)[Ovington, Mary White]. https://collections.library.yale.edu/catalog/16207122.