MLA

Koch, Frederick R. (Frederick Robinson). Music/George Dandin. Box 104, folder 1446. [1873-74]. https://collections.library.yale.edu/catalog/2020947.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 104, folder 1446"])([1873-74])[Music/George Dandin]. https://collections.library.yale.edu/catalog/2020947.