1. American Academy of Otolaryngology-Head and Neck Surgery (AAO-HNS) (1997) Otologic Referral Criteria for Occupational Hearing Conservation Programs. Alexandria, VA
2. American Academy of Otolaryngology (AAO) (1979) Committee on hearing and equilibrium and the American Council of Otolaryngology Committee on the medical aspects of noise: guide for the evaluation of hearing handicap. J Am Med Assoc 241(19):2055–2059
3. American National Standards Institute (ANSI) (1969) Specification for audiometers. American National Standards Institute, New York (ANSI-S3.6-1969)
4. American National Standards Institute (ANSI) (1977) Criteria for Permissible Ambient Noise during Audiometric Testing. American National Standards Institute, New York (ANSI-S3.1-1977)
5. Anon T (1984) Exposure of construction workers to noise. Technical Note 115. Construction Industry Research and Information Association, London