MLA

Wilder, Thornton, 1897-1975. Wilder portraits. Box 152, folder 3668-3670. n.d.. https://collections.library.yale.edu/catalog/16587323.

APA, 6th edition

Wilder, Thornton, 1897-1975. (["Box 152, folder 3668-3670"])(n.d.)[Wilder portraits]. https://collections.library.yale.edu/catalog/16587323.