1. American Speech-Language-Hearing Association. (2005). Acoustics in educational settings: Position statement [Position Statement]. Available from www.asha.org/policy.
2. Berg F. S. (1993). Acoustics and sound systems in schools. San Diego CA: Singular.
3. Colton R. H. & Casper J. K. (1990). Understanding voice problems: A physiological perspective for diagnosis and treatment. Baltimore MD: Williams & Wilkins.
4. Voice Characteristics of Female Physical Education Student Teachers
5. Measurement of vocal fold intraglottal pressure and impact stress