1. Battelle and Texas A&M Transportation Institute (2014) MAP-21 air quality and congestion mitigation measure outcomes assessment study: Project performed in cooperation with the U.S. Department of Transportation, Federal Highway Administration, and the Environmental Protection Agency. Technical report. FHWA-HEP-15-002. September 2014.
http://www.fhwa.dot.gov/environment/air_quality/cmaq/research/outcomes_assessment/index.cfm
. Accessed 1 May 2016
2. Brauer M, Reynolds C, Hystad P (2013) Traffic-related air pollution and health in Canada. Can Med Assoc J 185(18):1557–1558
3. Campbell DT, Russo MJ (1999). Social experimentation. Sage, Thousand Oaks
4. Campbell DT, Stanley JC (1966) Experimental and quasi-experimental designs for research. Rand McNally, Chicago
5. Centers for Disease Control and Prevention (2015) Stroke facts.
http://www.cdc.gov/stroke/facts.htm
. Accessed 24 Mar 2015