MLA

Koch, Frederick R. (Frederick Robinson). Auric, Nora. Box 47, folder 968. [1932-ca.1950]. https://collections.library.yale.edu/catalog/16601839.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 47, folder 968"])([1932-ca.1950])[Auric, Nora]. https://collections.library.yale.edu/catalog/16601839.