MLA

Hughes, Langston, 1902-1967. Washington, Fredi. Box 167, folder 3069. 1943-50. https://collections.library.yale.edu/catalog/17033997.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 167, folder 3069"])(1943-50)[Washington, Fredi]. https://collections.library.yale.edu/catalog/17033997.