MLA

Hughes, Langston, 1902-1967. McKay, Claude. Box 7 (Oversize), folder 86. 1893-1954. https://collections.library.yale.edu/catalog/16198534.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 7 (Oversize), folder 86"])(1893-1954)[McKay, Claude]. https://collections.library.yale.edu/catalog/16198534.