MLA

Wilder, Thornton, 1897-1975. Holograph manuscript. Box 119, folder 2695. n.d.. https://collections.library.yale.edu/catalog/32267601.

APA, 6th edition

Wilder, Thornton, 1897-1975. (["Box 119, folder 2695"])(n.d.)[Holograph manuscript]. https://collections.library.yale.edu/catalog/32267601.