MLA

McKay, Claude, 1890-1948. "Claude McKay," biography, typescript carbon. Box 13, folder 430. n.d.. https://collections.library.yale.edu/catalog/16742368.

APA, 6th edition

McKay, Claude, 1890-1948. (["Box 13, folder 430"])(n.d.)["Claude McKay," biography, typescript carbon]. https://collections.library.yale.edu/catalog/16742368.