1. OSHA 1970—Walch, Healy Public Contract Acts, Section 50-20410.10.
2. Instruments for Industrial Noise Level Measurement, Gen Rad, Concord, Mass.
3. Effect of sound on dentists;Park;Dent Clin North Am,1978
4. High-speed drill noise and hearing: Audiometric survey of 70 dentists;Forman-Franco;J Am Dent Assoc,1978