1. Subjective response to traffic noise;Griffiths;J. Sound Vib.,1968
2. The traffic noise index: a method of controlling noise nuisance;Langdon;BRS Current Paper,1968
3. Traffic noise criteria;Scholes;BRS Current Paper 38/69,1969
4. The traffic noise index;Langdon;NPL Lecture,1969
5. The traffic noise index;Langdon;Environmental Group Lecture, London,1968