Baron, Carol Kitzes. “Dating Charles Ives’s Music: Facts and Fictions.” Journal of the American Musicological Society Vol. 28, No. 1 (Winter 1990): 20-56.
Kirkpatrick, John, ed. A Temporary Mimeographed Catalogue of the Music Manuscripts and Related Materials of Charles Edward Ives, 1874-1954: given by Mrs. Ives to the Library of the Yale School of Music, September 1955. New Haven: Library of the Yale School of Music, 1960.