MLA

Koch, Frederick R. (Frederick Robinson). Fournier, Pierre. Box 48, folder 977. 1962 Nov 1. https://collections.library.yale.edu/catalog/16601848.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 48, folder 977"])(1962 Nov 1)[Fournier, Pierre]. https://collections.library.yale.edu/catalog/16601848.