MLA

Hughes, Langston, 1902-1967. Day, Carita. Box 4 (Oversize), folder 40. 1893-1954. https://collections.library.yale.edu/catalog/16196973.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 4 (Oversize), folder 40"])(1893-1954)[Day, Carita]. https://collections.library.yale.edu/catalog/16196973.