1. ANSI S3.4–1968: Procedure for the computation of loudness of noise. New York: American National Standards Institute, Inc., 1968.
2. ANSI S1.4–1971: Specification for sound level meters. New York: American National Standards Institute, Inc., 1971.
3. Beranek, L. L.: Acoustics. New York: McGraw-Hill Inc., 1954.
4. Report DS-67–6;DE Bishop,1967
5. Technical Rept. DS-67–10, Contract No. FA67WA-1705;DE Bishop,1967