Reference
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- Jackson , J. E. An Evaluation of the Variability in Audiometric Procedures. . Unpublished report
- 1954 . ASA Exploratory Subcommittee: The Relations of Hearing Loss to Noise Exposure, Z24-X-2–1954. , New York, New York : American Standards Association .
- Hinchclifke , R. 1959 . The Threshold of Hearing as a Function of Age. . Acustica , 9 : 303