MLA

Dreier, Katherine S. (Katherine Sophie), 1877-1952. "Who is Joseph Stella?," typescript carbon, corrected. Box 48, folder 1431. n.d.. https://collections.library.yale.edu/catalog/16694444.

APA, 6th edition

Dreier, Katherine S. (Katherine Sophie), 1877-1952. (["Box 48, folder 1431"])(n.d.)["Who is Joseph Stella?," typescript carbon, corrected]. https://collections.library.yale.edu/catalog/16694444.