1. Reprinted from the American Standard Acoustical Terminology, Z24–1-1951, American Standards Association, New York.
2. Radio-Electronics-Television Manufacturers Association (Now Electronic Industries Association), “Sound Systems.” Standard RS-160, December, 1951.
3. R.W. Young, “Scheme proposed for indicating reference quantities in level measurements.” Private communication, November, 1947.
4. Acoustics;Beranek,1954
5. “Handbook of Noise Control,”,1957