MLA

Wilder, Thornton, 1897-1975. Programs. Box 78, folder 2060-2061. 1938-48, n.d.. https://collections.library.yale.edu/catalog/2054170.

APA, 6th edition

Wilder, Thornton, 1897-1975. (["Box 78, folder 2060-2061"])(1938-48, n.d.)[Programs]. https://collections.library.yale.edu/catalog/2054170.