1. Noise nuisance caused by road traffic in residential areas: Part I;Langdon;Journal of Sound and Vibration,1976
2. Subjective response to road traffic noise;Griffiths;Journal of Sound and Vibration,1968
3. The concept of noise pollution level;Robinson;National Physical Laboratory Aero Report AC,1969
4. Aircraft Noise Annoyance around Heathrow Airport. S.S. 337;McKennell,1963
5. U.S. Government Document 550/9 74-004,1974