MLA

Wilder, Thornton, 1897-1975. Bankhead, Tallulah. Box 15, folder 368. 1942, n.d.. https://collections.library.yale.edu/catalog/33436574.

APA, 6th edition

Wilder, Thornton, 1897-1975. (["Box 15, folder 368"])(1942, n.d.)[Bankhead, Tallulah]. https://collections.library.yale.edu/catalog/33436574.