Animal Pictures. 9 Apr. 2002 <http://www.startingpage.com/html/animals.html>.

Community, Overpopulation. Overpopulation: Humans are Dense. 15 Apr. 1997. 25 Mar. 2002 <http://www.overpop.org/>.

Community, Overpopulation. Overpopulation Bomb. 5 July 1997. 22 Mar. 2002 <http://overpop.org/bomb.htm>.

Community, Overpopulation, Overpopulation Community, and Overpopulation Issues. Overpopulation. <http://www.overpopulation.com/>.

Online, World Book. World Book. 5 Apr. 2002 <http://www.aolsvc.worldbook.aol.com/wbol/wbPage/na/ar/co/182428?op1=&st1=Pollution&op2=&st2=&op3=&st3=>.

World Book. 6 Apr. 2002 <http://search.aolsvc.worldbook.aol.com/wbol/wbSearch/na/se/co?st1=Pollution>.