3Garry E Clarke,Essays on American Music,Greenwood Publishing Group, 1977 ,p. 125.
4Charles E. Ives, "Foreword", The Unanswered Question,Peer Musikverlag G. M. B. H., 1908 ,p. 3.
5Matthew McDonald, Silent Narration? Elements of Narrative in Ives's "The Unanswered Question", 19th-Century Music, vol. 27, No.3, pp.270-271.
6Matthew McDonald,Silent Narration? Elements of Narrative in Ires' s "The Unanswered Question", 19th-Century Music, vol.27, No.3, p.279.
7Stanley Sadie, The New Grove Dictionary of Music and Musicians, Oxford University, 2001, vol.9 ,p.417.
8Ralph Waldo Emerson,The Complete Writings of Ralph Waldo Emerson, New York: WM.H.WISE&CO, 1929, p.843.
9Thomas Dyer Winters ,Additive and Repetitive Techniques in the Experimental Works of Charles Ives,Ph.D. diss.,University of Pennsylvania, 1986,pp.24-126.
10Philip Lambert, The Music of Charles Ives ,New Haven:Yale University Press,1977,pp.53-65.
