1. Arnold, G.E. (1964) Clinical application of recent advances in laryngeal physiology. Ann. Otol. Rhinol. Laryngol., 73, 426–442.
2. Aronson, A.E. (1985) Clinical Voice Disorders. Thieme-Stratton, New York.
3. Bakal, D.J. (1979) Psychology and Medicine. Tavistock, London.
4. Baker, J. (1977) Emotional problems in relation to communication disorders — an overview. Aust. J. Human Commun. Dis., 5, 79.
5. Ballantyne, J. and Groves, J. (1981) Scott Brown’s Diseases of the Ear, Nose and Throat, 4th edn. Butterworth, London.