References
- Rice C. G., Coles R. R. A. Normal threshold of hearing for pure tones by earphone listening with a self-recording audiometric technique. J. acoust. Soc. Amer. 1966; 39: 1185–1187, (L)
- British Standards Institution. Normal threshold of hearing for pure tones by earphone listening. British Standard 1954; 2497
- American Standards Association. Audiometers for general diagnostic purposes. American Standard 1951, Z. 24.5
- International Organisation for Standardisation. Standard reference zero for the calibration of pure-tone audiometers. Recommendation 1964; 389
- International Organisation for Standardisation. Unofficial data on likely calibration figures for application of Recommendation 389 to TDH-39 earphones on 9A couplers. 1966
- Whittle L. S., Robinson D. W. British normal threshold of hearing. Nature 1961; 189: 617–618
- Cox J. R., Bilger R. C. Suggestion relative to the standardisation of loudness-balance data for the Telephonies TDH-39 earphone. J. acoust. Soc. Amer. 1960; 32: 773–774, (L)
- Wright H. N. Switching transients and threshold determination. J. Speech Hearing Res. 1958; 1: 52–60