Lucero, Jorge C. (1996). "Chest‐ and falsetto‐like oscillations in a two‐mass model of the vocal folds". The Journal of the Acoustical Society of America. 100 (5): 3355–3359. Bibcode:1996ASAJ..100.3355L. doi:10.1121/1.416976. ISSN0001-4966.
Lucero, Jorge C. (1996). "Chest‐ and falsetto‐like oscillations in a two‐mass model of the vocal folds". The Journal of the Acoustical Society of America. 100 (5): 3355–3359. Bibcode:1996ASAJ..100.3355L. doi:10.1121/1.416976. ISSN0001-4966.
Shewan, Robert (January–February 1979). "Voice classification: An examination of methodology". The NATS Bulletin. 35 (3): 17–27. ISSN0884-8106. OCLC16072337.
McKinney, James C (1994). The diagnosis and correction of vocal faults. Nashville, TN: Genovex Music Group. p. 213. ISBN978-1-56593-940-0. OCLC30786430.
Smith, Brenda; Thayer Sataloff, Robert (2005). Choral pedagogy. San Diego, CA: Plural Publishing. ISBN978-1-59756-043-6. OCLC64198260.
Lucero, Jorge C. (1996). "Chest‐ and falsetto‐like oscillations in a two‐mass model of the vocal folds". The Journal of the Acoustical Society of America. 100 (5): 3355–3359. Bibcode:1996ASAJ..100.3355L. doi:10.1121/1.416976. ISSN0001-4966.