MLA

Dreier, Katherine S. (Katherine Sophie), 1877-1952. "Abstract Art: The Contribution of the 20th Century," typescript carbon, corrected. Box 45, folder 1321. 1931 Jan 31. https://collections.library.yale.edu/catalog/16694439.

APA, 6th edition

Dreier, Katherine S. (Katherine Sophie), 1877-1952. (["Box 45, folder 1321"])(1931 Jan 31)["Abstract Art: The Contribution of the 20th Century," typescript carbon, corrected]. https://collections.library.yale.edu/catalog/16694439.