1. U.S. Environmental Protection Agency, "Green Chemistry Program at EPA," http://www.epa.gov/gcc/pubs/epa_gc.html
2. iSUSTAIN™ Green Chemistry Index, "Welcome to the iSUSTAIN™ Green Chemistry Index v2.0," www.isustain.com
3. Environmental Directorate, Organisation for Economic Co-Operation and Development (OECD), Sustainable Chemistry, 2004 http://www.oecd.org/dataoecd/16/25/29361016.pdf
4. U.S. Environmental Protection Agency, "Green Chemistry," http://www.epa.gov/gcc/