MLA

Koch, Frederick R. (Frederick Robinson). Music/Prologo e fantasia. Box 300, folder 1642. [1981-82]. https://collections.library.yale.edu/catalog/2077258.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 300, folder 1642"])([1981-82])[Music/Prologo e fantasia]. https://collections.library.yale.edu/catalog/2077258.