1. Aikin, W.A. (1951) The Voice -An Introduction to Practical Phonology. Longmans, Green, London.
2. Alexander, F.M. (1932) The Use of Self. Methuen, London.
3. Andrews, S., Warner, J. and Stewart, R. (1986) EMG biofeedback and relaxation in the treatment of hyperfunctional dysphonia. Br. J. Disord. Commun., 21, 353–369.
4. Aronson, A.E. (1980) Clinical Voice Disorders: An Interdisciplinary Approach. Thieme-Stratton, New York.
5. Barlow, W. (1952) Postural homeostasis. Ann. Phys. Med., 1, 3.