MLA

Hughes, Langston, 1902-1967. McKay, Claude. Box 109, folder 2042-2044. 1924-48, n.d.. https://collections.library.yale.edu/catalog/17264712.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 109, folder 2042-2044"])(1924-48, n.d.)[McKay, Claude]. https://collections.library.yale.edu/catalog/17264712.