MLA

Koch, Frederick R. (Frederick Robinson). Music/Ariettes oubliées. Chevaux de bois. Box 319, folder 1703. 1885 Jan 10. https://collections.library.yale.edu/catalog/15824154.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 319, folder 1703"])(1885 Jan 10)[Music/Ariettes oubliées. Chevaux de bois]. https://collections.library.yale.edu/catalog/15824154.