Boeken

Stes,R. (2005) Stemstoornissen

stemmisbruik en verkeerd stemgebruik 

The science of the singing voice

Sundberg, J. (1987). The science of the singing voice. Illinois: Northern iliinois University Press. ISBN: 0-87580-120-X.

Therapeutic Breathing Exercise

Wu, K.K., Z. Ping (1989). Therapeutic Breathing Exercise.
Hong Kong: Hai Feng Publishing Co. ISBN: 962-238-035-2.