References
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- 1983 . Acoustical Society of America, American National Standard ANSI S1.4 New York
- 1978 . Acoustical Society of America, American National Standard ANSI S1.25 New York
- American Conference of Governmental Industrial Hygienists, Air Sampling Instruments for Evaluation of Atmospheric Contaminants, Sixth Edition . Cincinnati : ACGIH .
- 1985 . American Industrial Hygiene Association, Manual of Recommended Practice for Portable Direct-Reading Carbon Monoxide Indicators , Akron : AIHA .
- 1980 . Occupational Safety and Health Administration: Industrial Hygiene Field Operations Manual , U.S. Department of Labor .