Cite

Music/Sinfonia concertante, piano, orchestra, revised version

MLA

Koch, Frederick R. (Frederick Robinson). Music/Sinfonia concertante, piano, orchestra, revised version. Box 218, folder 1560. [1943]. https://collections.library.yale.edu/catalog/2005188.

APA, 6th edition

Koch, Frederick R. (Frederick Robinson). (["Box 218, folder 1560"])([1943])[Music/Sinfonia concertante, piano, orchestra, revised version]. https://collections.library.yale.edu/catalog/2005188.