MLA

Wilder, Thornton, 1897-1975. Holograph manuscripts. Box 118, folder 2662-2664. n.d.. https://collections.library.yale.edu/catalog/17056681.

APA, 6th edition

Wilder, Thornton, 1897-1975. (["Box 118, folder 2662-2664"])(n.d.)[Holograph manuscripts]. https://collections.library.yale.edu/catalog/17056681.