MLA

McKay, Claude, 1890-1948. "Home Thoughts," typescript carbon. Box 12, folder 368. n.d.. https://collections.library.yale.edu/catalog/32268819.

APA, 6th edition

McKay, Claude, 1890-1948. (["Box 12, folder 368"])(n.d.)["Home Thoughts," typescript carbon]. https://collections.library.yale.edu/catalog/32268819.