References

1. University of San Francisco, Master of Science in Environmental Management, http://www.usfca.edu/envsci/
2. S. E. Manahan, Environmental Chemistry, 6th Edition, Lewis Publishers, Boca Raton, 1994.
3. T. G.Spiro and W. M. Stigliani, Chemistry of the Environment, Prentice Hall, New Jersey, 1996
4. C. Baird, Environmental Chemistry, W.H. Freeman and Co., New York, 1995
5. The Montreal Protocol on Substances that Deplete the Ozone Layer. http://unep.org/ozone/montreal.htm
6. Johns Hopkins University Subcommittee on Electronic and Distance Education, http://distance.jhsph.edu/SEDE/
7. University of Waterloo Distance and Continuing Education, http://dce.uwaterloo.ca/