Sources

National Council of Teacher of Mathematics.  (2000).

       Principles and standards for school mathematics.  Retrieved

       November 8, 2004, from http://standards.nctm.org/

Sussman, A.  (2000).  Dr. Art's guide to planet Earth.  San

       Francisco, CA:  WestEd.  

Sussman, A. (2000).  Dr. Art's guide to planet Earth.  Retrieved

       November 8, 2004, from

       http://www.planetguide.net/index.html

Marcellino, S.  (2003).  Dr. Art's guide to planet Earth.  Retrieved

       November 8, 2004, from

       http://www.ecoliteracy.org/pages/newsletter2_sussman.html

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