MLA

Schwartz, Delmore, 1913-1966. Letters from lawyers. Box 21, folder 824. 1958-1959. https://collections.library.yale.edu/catalog/17078956.

APA, 6th edition

Schwartz, Delmore, 1913-1966. (["Box 21, folder 824"])(1958-1959)[Letters from lawyers]. https://collections.library.yale.edu/catalog/17078956.