1. Prevalence of hearing loss and differences by demographic characteristics among US adults;Agrawal;Arch. Intern. Med.,2008
2. American National Standards Institute (ANSI), 1991. Maximum Permissible Ambient Noise Levels for Audiometric Test Rooms (ANSI S3.1-1991). ANSI, New York.
3. American National Standards Institute (ANSI), 1996. Specifications for Audiometers (ANSI S3.6-1996). ANSI, New York.
4. ANSI, 1999. American National Standard Maximum Permissible Ambient Noise Levels for Audiometric Test Rooms. (ANSI S3.1-1999). ANSI, New York.
5. American National Standards Institute, 2004. American National Standard Specification for Audiometers. (ANSI S3.6-2004), New York.