References
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- National Academy of Science . 1996 . National science education standards , Washington, DC : National Academy Press .
- National Science Teachers Association . 1992 . Scope, sequence and coordination of secondary school science. Vol. 1. The content core: A guide for curriculum design , Vol. 1 , Washington, DC : Author .
- Gabel , D. 1995 . Presidential address: Unity within our diversity. NARST [National Association for Research in Science Teaching] . News , 37 : 7 – 9 .
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