MLA

Hughes, Langston, 1902-1967. Dunn, Blanche. Box 4 (Oversize), folder 47. 1893-1954. https://collections.library.yale.edu/catalog/16196980.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 4 (Oversize), folder 47"])(1893-1954)[Dunn, Blanche]. https://collections.library.yale.edu/catalog/16196980.