MLA

Hughes, Langston, 1902-1967. Brooks, Gwendolyn. Box 466, folder 11369. 1950. https://collections.library.yale.edu/catalog/17318618.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 466, folder 11369"])(1950)[Brooks, Gwendolyn]. https://collections.library.yale.edu/catalog/17318618.