^Haluska, Jan (2003). The Mathematical Theory of Tone Systems, p.xxiv. ISBN 0-8247-4714-3. 19th harmonic, overtone minor tone.
^Curtis ME, Bharucha JJ. The minor third communicates sadness in speech, mirroring its use in music. Emotion. June 2010, 10 (3): 335–48. PMID 20515223. doi:10.1037/a0017928.
^Alexander J. Ellis (translating Hermann Helmholtz): On the Sensations of Tone as a Physiological Basis for the Theory of Music, page 455. Dover Publications, Inc., New York, 1954. "16:19...The 19th harmonic, ex. 297.513 [cents]". Later reprintings: ISBN 1-150-36602-8 or ISBN 1-143-49451-2.
^John Fonville. "Ben Johnston's Extended Just Intonation- A Guide for Interpreters", p.124, Perspectives of New Music, Vol. 29, No. 2 (Summer, 1991), pp. 106-137.