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↑ Benade, Arthur H (2014). Horns, Strings, and Harmony. Courier, Dover Books on Music. p. 83.CS1 maint: Uses authors parameter (link)
↑ "Combination Tone - acoustics". Encyclopædia Britannica. สืบค้นเมื่อ 2018-01-27.
↑ Britannica Online 2018 "Combination tones are heard when two pure tones (i.e., tones produced by simple harmonic sound waves having no overtones), differing in frequency by about 50 cycles per second [Hertz] or more, sound together at sufficient intensity."
↑ Beament, James (2001). How We Hear Music. The Boydell Press. pp. 81–2.CS1 maint: Uses authors parameter (link)
↑ Mathews, Max V; Pierce, John R (1989). Mathews, Max V; Pierce, John R, eds. The Bohlen-Pierce Scale. Current Directions in Computer Music Research. MIT Press. p. 167.CS1 maint: Uses authors parameter (link) CS1 maint: Uses editors parameter (link)
↑ Randel, Don Michael (2003). The Harvard Dictionary of Music. Harvard. p. 192.CS1 maint: Uses authors parameter (link)
↑ Maitland, J. A. Fuller, eds. (1909). Grove's Dictionary of Music and Musicians. 4. Macmillan. p. 76.CS1 maint: Uses editors parameter (link)
↑ Wedgwood, James Ingall (1907). A Comprehensive Dictionary of Organ Stops: English and foreign, ancient and modern: practical, theoretical, historical, aesthetic, etymological, phonetic (2nd ed.). G. Schirmer. p. 1.

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