MLA

Koch, Frederick R. (Frederick Robinson). Music/Varii capricii: score. Box 309, folder 1651. [1975-76]. https://collections.library.yale.edu/catalog/2077418.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 309, folder 1651"])([1975-76])[Music/Varii capricii: score]. https://collections.library.yale.edu/catalog/2077418.