MLA

Koch, Frederick R. (Frederick Robinson). Jourdan-Morhange, Hélène. Box 52, folder 1105. 1922. https://collections.library.yale.edu/catalog/2065836.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 52, folder 1105"])(1922)[Jourdan-Morhange, Hélène]. https://collections.library.yale.edu/catalog/2065836.