References
- Anon. The household dictionary of the English language. Collins, London 1891
- Richardson B. W. Some researches with Professor Hughes' new instrument for the measurement of hearing: the audiometer. Proc. R. Soc. Lond. 1879; 29: 65–70
- Stephens S. D. G. Centenary of British audiometry. Br. J. Audiol. suppl. 1979a; 2
- Stephens S. D. G. Audiometer from Hughes to modern times. Br. J. Audiol. 1979b; 13: 17–20