References

  1. Bocknek, Jonathon. "The Science of Plants." Gareth Stevens Publishing: Milwaukee, 1999. ISBN 0-8368-2467-9
  2. Catherall, Ed. "Exploring Plants." Steck-Vaughn Company: Austin, 1992. ISBN 0-8114-2601-7
  3. Gale, Frank C. and Clarice W. "Experiences with Plants for Young Children." Pacific Books: Palo Alto, 1975. ISBN 0-87015-211-4.
  4. Hewitt, Sally. "Plants and Flowers." Children’s Press, Groiler Publishing: New York, 1998. ISBN 0-516-21176-5.
  5. Leonard, Joan. Green House Director, Department of Plant Biology, The Ohio State University.
  6. Riley, Peter. "Plant Life." Groiler Publishing: New York, 1998. ISBN 0-531-14507-7
  7. Van Cleave, Janice. "Janice Van Cleave’s Plants." John Wiley and Sons, Inc.: New York, 1997. ISBN 0-471-14687-0
  8. Watts, May Theilgard. "Tree Finder," Nature Study Guild Publishers: Rochester, 1991. ISBN 0-912550-01-5.
  9. "Tree," Microsoft Encarta Online Encyclopedia 2002. http://encarta.msn.com
  10. http://ltpwww.gsfc.nasa.gov/globe/index.html , Soil Science Education Home Page.
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