Vorperian HK, Wang S, Chung MK, Schimek EM, Durtschi RB, Kent RD, Ziegert AJ, Gentry LR. (2009) Anatomic development of the oral and pharyngeal portions of the vocal tract: an imaging study. Journal of the Acoustical Society of America. Mar;125(3):1666-78.
Vorperian, PhD, H. K. Anatomic Development of the Oral and Pharyngeal Portions of the Vocal Tract: An Imaging Study.