^ 1.01.11.2Nattiez, Jean-Jacques (1990) [1987]. Music and Discourse: Toward a Semiology of Music (Musicologie générale et sémiologue). Translated by Carolyn Abbate (1990). Princeton, N.J.: Princeton University Press. p. 202. ISBN0-691-02714-5. Undertone series shown on E.
^ 2.02.1Dallos, Peter. The Auditory Periphery Biophysics and Physiology. Elsevier. 2012: 2012.
^Sotorrio, José A (2002). Tone Spectra -and the Natural Elements of Music. (1st Ed) Spectral Music, 2002.
^Truax, Barry (编). Handbook for Acoustic Ecology. World Soundscape Project, Simon Fraser University. 1999 [2019-04-08]. (原始内容存档于2018-08-02).
^Rehding, Alexander (2003). Hugo Riemann and the Birth of Modern Musical Thought, p.16. ISBN978-0-521-82073-8给出高达9次谐音,但没有标出数字。
^ 7.07.1(1893). "Russian Folk-Songs", Music (页面存档备份,存于互联网档案馆): a monthly magazine, devoted to the art, science, technic and literature of music, Volume 4, p.131. W.S.B. Mathews.
^Hindemith, Paul. The Craft of Musical Composition. 由Authur Mendel翻译 revised. New York: Associated Music Publishers. 1945: 78 [1937]. ISBN 0-901938-30-0. It seems to me repugnant to good sense to assume a force capable of producing such an inversion. ... [The undertone series] can never have for music the same significance as the overtone series. ... This "undertone series" has no influence on the color of the tone, and lacks the other natural advantages of the overtone series...
^Partch, Harry. Genesis of a Music second. New York: Da Capo Press. 1974: 89 [1949]. ISBN 0-306-80106-X. Under-number tonality, or Utonality ("minor"), is the immutable faculty of ratios, which in turn represent an immutable faculty of the human ear.
^Graham H. Jackson, The Spiritual Basis of Musical Harmony, George A. Vanderburgh, Shelburne, ON, Canada, 2006, 196 pp.
^Adolf von Thimus: Die Harmonikale Symbolik des Altertums, Verlag der M. DuMont-Schaubergischen Buchhandlung, K?ln, 1868