MLA

Koch, Frederick R. (Frederick Robinson). Music/Passacaglia, violoncello. Box 339, folder 1983. [1979-80?]. https://collections.library.yale.edu/catalog/2036843.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 339, folder 1983"])([1979-80?])[Music/Passacaglia, violoncello]. https://collections.library.yale.edu/catalog/2036843.