1. American Industrial Hygiene Association (AIHA) . (2009) Mathematical models for estimating occupational exposure to chemicals. In Charles B. Keil, Chaterine E. Simmons, editors. 2nd ed., stock number KIT_AEAM09-379, Falls Church, VA: AIHA. 207 p.
2. The photovoltaic industry on the path to a sustainable future — Environmental and occupational health issues
3. A UK Scheme to Help Small Firms Control Health Risks from Chemicals: Toxicological Considerations
4. Bureau of Labor Statistics . (2013) Employment in green goods and services – 2011 [News Release]. Washington, DC: Bureau of Labor Statistic, U.S. Department of Labor. Available at http://www.bls.gov/news.release/pdf/ggqcew.pdf. Accessed 1 April 2015.
5. Canadian Standards Association (CSA) . (2011) CAN/CSA-Z94.4–11- Selection, use and care of respirators. Mississauga, ON: Canadian Standards Association.