1. AAOO (American Academy of Ophthalmology and Otolaryngology). Guide for conservation of hearing in noise. A supplement to the transactions. Revised 1964.
2. ASA Standard Z24.5. American standard specifications for audiometers for general diagnostic purposes, 1951.
3. ASA Standard Z24-X-2. The relations of hearing loss to noise exposure, 1954.
4. Atherley, G. R. C. and Noble, W. G. Clinical picture of Occupational hearing loss obtained with the hearing measurement scale. Occupational Hearing Loss Conference, National Physics Laboratory, Teddington, England, March 1970.
5. Noise Control - Percent of Population Protected