MLA

Hughes, Langston, 1902-1967. Davis, Griffith. Box 477, folder 11856. 1946, n.d.. https://collections.library.yale.edu/catalog/2111731.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 477, folder 11856"])(1946, n.d.)[Davis, Griffith]. https://collections.library.yale.edu/catalog/2111731.