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  • "A Toolbox for Alleviating Traffic Congestion." The Institute of Transportation Engineers. 1989.
  • "Introduction of traffic congestion pricing in Seoul, Korea." Asia-Pacific Environmental Innovation Strategies Research. April 29, 2003.
  • "Road Traffic and Air Pollution." It's Your Health. Health Canada. May, 2004.
  • "State of the Air: 2007." American Lung Association.
  • "Traffic pollution - measuring the real damage." September 21, 2005.
  • "Traffic pollution 'kills thousands every year.'" September 1, 2000.
  • Albert, Tanya. "Widening Roads Worsens Traffic Congestion." The Cincinnati Enquirer. January 13, 2000.
  • Arnott, Richard. "Alleviating Traffic Congestion: Alternatives to Road Pricing." Taxation, Resources and Economic Development (TRED) Conference. September, 1994.
  • Beaty, William. "Traffic Waves."
  • Bowlden, Terry, et al. "Building Better Communities: A Toolkit for Quality Growth." The Quality Growth Coalition. 2000.
  • City of Los Angeles Demographics - 1990 & 2000 Census
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  • Poole, Fiona. "Traffic Congestion." House of Commons Library. January 28, 1998.
  • Schrank, David and Lomax, Tim. "The 2007 Urban Mobility Report." Texas Transportation Institute. September, 2007.
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  • Taylor, Brian D. "Rethinking Traffic Congestion." Access. October 1, 2002.