MLA

Wilder, Thornton, 1897-1975. Miscellaneous 1920s pictures. Box 149, folder 3556. n.d.. https://collections.library.yale.edu/catalog/2037322.

APA, 6th edition

Wilder, Thornton, 1897-1975. (["Box 149, folder 3556"])(n.d.)[Miscellaneous 1920s pictures]. https://collections.library.yale.edu/catalog/2037322.