MLA

Wilder, Thornton, 1897-1975. Typescript carbon. Box 92, folder 2312. n.d.. https://collections.library.yale.edu/catalog/17056678.

APA, 6th edition

Wilder, Thornton, 1897-1975. (["Box 92, folder 2312"])(n.d.)[Typescript carbon]. https://collections.library.yale.edu/catalog/17056678.