1. www.cooltext.com
2. www.explorescience.com
Electronic Sources
Publications
on CD-ROM, Diskette, or Magnetic Tapes, WWW
1. www.webelements.com
2. www.chemicalelements.com
3. homepages.go.com/~rbleil/bonding.htm
Printed Materials
Part of a book
1. World Book Millennium 2000. "Chemistry" Volume 3. New York: World Book Inc., 2000, pp.402
Printed Materials
Entire book
1. VanCleave, Janice. "Janice VanCleave's Chemistry for Every Kid" New York. Wiley. 1989.
2. Popular Science. "The New Book of Popular Science 3" Philippines. Groiler Inc. 1992.
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