MLA

Koch, Frederick R. (Frederick Robinson). Jeritza, Maria. Box 57, folder 1261. 1944-49. https://collections.library.yale.edu/catalog/16601865.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 57, folder 1261"])(1944-49)[Jeritza, Maria]. https://collections.library.yale.edu/catalog/16601865.