MLA

Koch, Frederick R. (Frederick Robinson). Music/Music for Children. Box 296, folder 1638. [1940-41]. https://collections.library.yale.edu/catalog/2025153.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 296, folder 1638"])([1940-41])[Music/Music for Children]. https://collections.library.yale.edu/catalog/2025153.