MLA

Hughes, Langston, 1902-1967. Cartwright, Marguerite. Box 3 (Oversize), folder 26. 1954. https://collections.library.yale.edu/catalog/16195662.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 3 (Oversize), folder 26"])(1954)[Cartwright, Marguerite]. https://collections.library.yale.edu/catalog/16195662.