epa.gov.com.  “ Ozone Science: The Facts Behind the Phaseout” 26, December 2007
http://www.epa.gov/ozone/science/sc_fact.html

owl.com.  “ Never Destroy Anything You Cant Repair” 1999  N. Tarasova
http://www.owl.ru/eng/womplus/1997/ecole.htm
 

un.org. “ Damage To The Ozone Layer” 1996-2003 D. Albrittin
            www.un.org/earthwatch/atmosphere/ozonedepletion.html

eps.gov. “ Protecting The Stratospheric Ozone Layer” 2, May 2007
www.epa.gov/air/caa/peg/stratozone.html

umich.edu.  “ The Ozone Layer: Important Components Of Ozone Education”
 9, February 1998 A. Arbor
       www.umich.edu/~265/society/ozone.html 

leaderu.com.  “ Tracking The Ozone Layer” 14, July 2002 Forrset M. Mims III
www.leaderu.com/science/ozone.html

Gay, K {1998} o-zone
United States Of America
IMPACT Publishing