Mikhashoff, Yvar. A thematic survey of the first movement (Emerson) of the Sonata no. 2, “Concord, Mass. 1840-1860” of Charles Ives. Unpublished manuscript. Yvar Mikhashoff Papers. Mss. 10, Folder 6. Music Library, University at Buffalo. 198?.
Haskell, Harry. “Paul Rosenfeld, ‘Ives’s Concord Sonata’.” In The attentive listener: three centuries of music criticism. Princeton, NJ: Princeton University Press, 1996.