MLA

Koch, Frederick R. (Frederick Robinson). Music/The Quest: score, partly in holograph. Box 302, folder 1644. [1943]. https://collections.library.yale.edu/catalog/2077255.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 302, folder 1644"])([1943])[Music/The Quest: score, partly in holograph]. https://collections.library.yale.edu/catalog/2077255.