Reference
- Peterson Arnold , P. G. and Leo Beranek , L. 1956 . Handbook of Noise Measurement , 3rd Ed. , West Concord, Massachusetts : General Radio Company .
- 1958 . American Industrial Hygiene Association: Industrial Noise Manual. , 27 Detroit, Michigan : American Industrial Hygiene Association .
- Harris Cyril , M. 1957 . Handbook of Noise Control. , New York, New York : McGraw-Hill .