MLA

McKay, Claude, 1890-1948. Draft, typescript, corrected. Box 11, folder 335. n.d.. https://collections.library.yale.edu/catalog/11803472.

APA, 6th edition

McKay, Claude, 1890-1948. (["Box 11, folder 335"])(n.d.)[Draft, typescript, corrected]. https://collections.library.yale.edu/catalog/11803472.