MLA

Dreier, Katherine S. (Katherine Sophie), 1877-1952. Drafts, typescript and carbon, corrected. Box 43, folder 1287. n.d.. https://collections.library.yale.edu/catalog/2040527.

APA, 6th edition

Dreier, Katherine S. (Katherine Sophie), 1877-1952. (["Box 43, folder 1287"])(n.d.)[Drafts, typescript and carbon, corrected]. https://collections.library.yale.edu/catalog/2040527.