MLA

Wilder, Thornton, 1897-1975. Portraits of Wilder. Box 155, folder 3781-3782. 1949. https://collections.library.yale.edu/catalog/2037342.

APA, 6th edition

Wilder, Thornton, 1897-1975. (["Box 155, folder 3781-3782"])(1949)[Portraits of Wilder]. https://collections.library.yale.edu/catalog/2037342.