MLA

Koch, Frederick R. (Frederick Robinson). Music/Aimons sur l'onde harmonieuse. Box 328, folder 1822. n.d.. https://collections.library.yale.edu/catalog/12215019.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 328, folder 1822"])(n.d.)[Music/Aimons sur l'onde harmonieuse]. https://collections.library.yale.edu/catalog/12215019.