1. Ashley, J. (1991) The Silent House. Being Deaf: The Experience of Deafness, (eds G. Taylor and J. Bishop), The Open University, Milton Keynes.
2. British Standards Institution (1981) BS 6083: Part 4, Hearing Aids: Specification for Magnetic Field Strength in Audio-frequency Induction Loops for Hearing Aid Purposes, British Standards Institution.
3. British Standards Institution (1988) BS 2497: Part 5, Standard Reference Zero for the Calibration of Pure-Tone Air Conduction Audiometers, British Standards Institution.
4. Goldstein, D.P. and Stevens, S.D.G. (1981) Audiological Rehabilitation: Management Model I. Audiology, 20, 432–52.
5. Haggard, M.P., Gatehouse, S. and Davies, A.C. (1981) The High Prevalence of Hearing Disorders and its Implications for Services in the UK. British journal of Audiology, 15, 241–51.