1. The effect sound-field amplification has on teacher vocal abuse problems;Allen,1995
2. Vocal pathology of teachers;Calas;Rev Laryngol Otol Rhinol (Bord),1989
3. Vocal fatigue among teachers;Gotaas;Folia Phoniatr (Basel),1993
4. Understanding Voice Problems;Colton,1996
5. Instrumental analysis and control of vocal behavior;Holbrook,1977