MLA

Hughes, Langston, 1902-1967. Adler, Felix. Box 22, folder 344. 1875-1978. https://collections.library.yale.edu/catalog/16207117.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 22, folder 344"])(1875-1978)[Adler, Felix]. https://collections.library.yale.edu/catalog/16207117.