Maltz, Richard Steven. “Microtonal techniques in Charles Ives's 'Three quarter-tone pieces for two pianos, ' Harry Patch's 'And the seventh day petals fell in Petaluma', and Ben Johnston's 'Fourth string quartet’.” Ph.D. diss., University of South Carolina, 1991.
Coleman, Donna. “A source study of the fifth movement of Charles Ives's first piano sonata: toward a critical edition.” D.M.A. thesis, University of Rochester, 1986.
Robinson, Bradley Craig. “A study of Charles Ives's use of self-borrowing in the composition of selected songs for solo voice and piano.” D.M.A. diss., University of Illinois at Urbana-Champaign, 1999.