1. The New Voice Pedagogy;David,1995
2. Foundations of the Singer's Art;Fields,1977
3. Comprehensive Choral Music Education;Hylton,1995
4. Singing: The Physical Nature of the Vocal Organ; a Guide to the Unlocking of the Singing Voice;Husler,1965
5. What happens during vocal warm-up?;Elliot;J Voice,1995