Suggestions for further reading
- Ristad, E. A soprano on he Head. Utah, Real People Press, 1982.
- Green, B. The Inner Game of Music. London Pan Books, 1987.
- Stewart, R. J. Music and the Elemental Psyche. Wellingborough, Aquarian Press, 1987.
- Linklater, K. Freeing the Natural Voice. ISBN-89676-0715