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Geringer & Worthy 1999, pp. 135–149. Geringer, J. M.; Worthy, M.D. (1999). "Effects of Tone-Quality Changes on Intonation and Tone-Quality Ratings of High School and College Instrumentalists". Journal of Research in Music Education. 47 (2): 135–149. doi:10.2307/3345719. JSTOR3345719. S2CID144918272.
Geringer & Worthy 1999, pp. 135–149. Geringer, J. M.; Worthy, M.D. (1999). "Effects of Tone-Quality Changes on Intonation and Tone-Quality Ratings of High School and College Instrumentalists". Journal of Research in Music Education. 47 (2): 135–149. doi:10.2307/3345719. JSTOR3345719. S2CID144918272.
Geringer & Worthy 1999, pp. 135–149. Geringer, J. M.; Worthy, M.D. (1999). "Effects of Tone-Quality Changes on Intonation and Tone-Quality Ratings of High School and College Instrumentalists". Journal of Research in Music Education. 47 (2): 135–149. doi:10.2307/3345719. JSTOR3345719. S2CID144918272.