1. American Academy of Opthalmology and Otolaryngology, Guide for conservation of hearing in noise (revised), 1969.
2. American Industrial Hygiene Association, Industrial Noise Manual, 1966.
3. American National Standards Institute, Physical measurement of sound, method for. S 1.2–1962.
4. American National Standards Institute, General-purpose sound level meters, specifications for. S1.4—1961.
5. American National Standards Institute, Preferred frequencies and band numbers for acoustical measurements. S 1.6—1967.