MLA

Koch, Frederick R. (Frederick Robinson). Tamagno, Francesco. Box 50, folder 1056. 1888-92. https://collections.library.yale.edu/catalog/16101629.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 50, folder 1056"])(1888-92)[Tamagno, Francesco]. https://collections.library.yale.edu/catalog/16101629.