MLA

Koch, Frederick R. (Frederick Robinson). Music/A Song for the Lord Mayor's Table: arrangement for voice and orchestra. Box 303, folder 1645. [1970]. https://collections.library.yale.edu/catalog/2077269.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 303, folder 1645"])([1970])[Music/A Song for the Lord Mayor's Table: arrangement for voice and orchestra]. https://collections.library.yale.edu/catalog/2077269.