MLA

Koch, Frederick R. (Frederick Robinson). Music/Granada Preludes, Call Signs, and End Music. Box 292, folder 1634. [1962]. https://collections.library.yale.edu/catalog/10957772.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 292, folder 1634"])([1962])[Music/Granada Preludes, Call Signs, and End Music]. https://collections.library.yale.edu/catalog/10957772.