1. “Levels and Spectra of Traffic, Industrial, and Residential Area Noise.”;Bonvallet;J. Acoustical Soc. Am.,1951
2. “Levels and Spectra of Transportation Vehicle Noise.”;Bonvallet;J. Acoustical Soc. Am.,1950
3. Background Noise Study in Chicago;Caccavari,1973
4. Noise and Psychological State;Cohen,1968
5. The Benefits of Environmental Improvement: Theory and Practice;Freeman,1979