1. Subjective response to road traffic noise;Griffiths;Journal of Sound and Vibration,1968
2. F. J. Langdon and W. E. Scholes, The traffic noise index—a method of controlling noise nuisance, Building Research Station Current Paper CP 38/68
3. The concept of noise pollution level;Robinson,1969
4. An outline guide to criteria for the limitation of urban noise;Robinson,1968
5. Handbook of noise measurement;Peterson,1967