MLA

Koch, Frederick R. (Frederick Robinson). Music/Fanfare for the National. Box 338, folder 1973. [1974?]. https://collections.library.yale.edu/catalog/2005585.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 338, folder 1973"])([1974?])[Music/Fanfare for the National]. https://collections.library.yale.edu/catalog/2005585.