1. Acoustic Theory of Speech Production. s'Gravenhage;Fant,1960
2. Cleft Palate and Craniofacial Anomalies – Effects on Speech and Resonance;Kummer,2014
3. Preclinical Speech Science: Anatomy, Physiology, Acoustics, and Perception;Hixon,2008
4. Anatomy and physiology of the velopharyngeal mechanism;Perry;Semin Speech Lang,2011
5. Resonant voice therapy;Verdolini,2000