MLA

Wilder, Thornton, 1897-1975. Holograph manuscript. Box 92, folder 2314. n.d.. https://collections.library.yale.edu/catalog/10628825.

APA, 6th edition

Wilder, Thornton, 1897-1975. (["Box 92, folder 2314"])(n.d.)[Holograph manuscript]. https://collections.library.yale.edu/catalog/10628825.