MLA

Luhan, Mabel Dodge, 1879-1962. "Twelfth Night," typescript and typescript carbon, corrected. Box 60, folder 1524. n.d.. https://collections.library.yale.edu/catalog/17085376.

APA, 6th edition

Luhan, Mabel Dodge, 1879-1962. (["Box 60, folder 1524"])(n.d.)["Twelfth Night," typescript and typescript carbon, corrected]. https://collections.library.yale.edu/catalog/17085376.