1. AQS, 2006. Air Quality System. US EPA. 〈http://www.epa.gov/ttn/airs/airsaqs/detaildata/downloadaqsdata.htm〉. Accessed on 11/13/2006.
2. CARB, 2006. Ambient Air Quality Standards. California Air Resources Board. 〈http://www.arb.ca.gov/aqs/aaqs2.pdf〉. Accessed on 5/31/2006.
3. A study of social and economic implications of mobile sources on air quality in Lebanon;Chaaban;Transportation Research Part D,2001
4. Impact of methanol vehicles on ozone air quality;Chang;Atmospheric Environment,1989
5. Delucchi, M., McCubbin, D., 2004. The contribution of motor vehicle and other sources to ambient air pollution. Report #16 in the series: The Annualized Social Cost of Motor-Vehicle Use in the United States, based on 1990–1991 Data. Publication No. UCD-ITS-RR-96-3 (16) rev. 1, Institute of Transportation Studies, University of California at Davis.