MLA

Koch, Frederick R. (Frederick Robinson). Music/Canzone di Dante. Box 341, folder 2004. 1897 Jun 4, n.d.. https://collections.library.yale.edu/catalog/2043660.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 341, folder 2004"])(1897 Jun 4, n.d.)[Music/Canzone di Dante]. https://collections.library.yale.edu/catalog/2043660.