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Tanguiane 1994. Tanguiane, Andranick (1994). "A principle of correlativity of perception and its application to music recognition". Music Perception. 11 (4): 465–502. doi:10.2307/40285634. JSTOR40285634.
Schoenberg 2010, p. 26, "It is required of a chord that it consist of three different tones." Schoenberg, Arnold (2010). Theory of harmony. Berkeley, Calif: University of California. ISBN978-0-520-26608-7. OCLC669843249.