MLA

Koch, Frederick R. (Frederick Robinson). Music/The Quest: score in copyist's manuscript. Box 213, folder 1555. [1943]. https://collections.library.yale.edu/catalog/2077234.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 213, folder 1555"])([1943])[Music/The Quest: score in copyist's manuscript]. https://collections.library.yale.edu/catalog/2077234.