MLA

Schwartz, Delmore, 1913-1966. "Present Moments". Box 3, folder 178. 1940. https://collections.library.yale.edu/catalog/17405231.

APA, 6th edition

Schwartz, Delmore, 1913-1966. (["Box 3, folder 178"])(1940)["Present Moments"]. https://collections.library.yale.edu/catalog/17405231.