Kirkpatrick, John. “Chronology of the life and work of Charles Ives, 1874-1954.” Unpublished manuscript, microfilm. Irving S. Gilmore Music Library, Yale University Library, New Haven, Connecticut.
Correspondence from Charles and Harmony Twitchell Ives to Anton Rovinsky, 1928, 1951. General Manuscript Collection, Northwestern University Music Library, Evanston, Illinois.
Averill, Ron. “The use of quotation in 20th-century works by Ron Averill, Charles Dodge, and Charles Ives.” D. Mus. Thesis, University of Washington, 1995.