MLA

Hughes, Langston, 1902-1967. Harlem marchers. Box 22, folder 333. 1875-1978. https://collections.library.yale.edu/catalog/16207106.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 22, folder 333"])(1875-1978)[Harlem marchers]. https://collections.library.yale.edu/catalog/16207106.