1. WHO, Health aspects of air pollution with particulate matter, ozone and nitrogen dioxide: report on a WHO working group. World Health Organization, Bonn, Germany 13–15 January 2003.
2. WHO, Air quality guidelines for Europe. World Health Organization, 2000.
3. WHO, Evaluation and use of epidemiological evidence for environmental health risk assessment: Guideline document. World Health Organization, 2000.
4. Brunekreef, Bert et al. “Air pollution and health”, The Lancet, Volume 360, Issue 9341, 1233–1242.
5. Usha Gupta, “Valuation of Urban Air Pollution: A Case Study of Kanpur City in India”, ISSN 1893-1891; 2006-WP17 SANDEE Working Papers, 2006.