1. Singing: The Mechanism and the Technic;Vennard,1967
2. Discover Your Voice;Brown,1996
3. On the Art of Singing;Miller,1996
4. Breath Support directives used by singing teachers: a Delphi study;Spillane;The NATS,1989
5. Role of diaphragmatic activity during singing: a study of transdiaphragmatic pressures;Leanderson;J Appl Physiol,1987