MLA

Wilder, Thornton, 1897-1975. Manuscript notebook: Acts I and II. Box 91, folder 2310. n.d.. https://collections.library.yale.edu/catalog/17056676.

APA, 6th edition

Wilder, Thornton, 1897-1975. (["Box 91, folder 2310"])(n.d.)[Manuscript notebook: Acts I and II]. https://collections.library.yale.edu/catalog/17056676.