----------------------------------------------------------------------

American Association for the Advancement of Science Project 2061. (1983). Benchmarks for Science Literacy. New York: Oxford University Press.

American Association for the Advancement of Science Project 2061. (1989, 1990). Science for all Americans.. New York: Oxford University Press.

California State Department of Education. (1990). Science framework for California Public Schools Kindergarten through Grade 12. Sacramento: California State Department of Education.

National Research Council. (1996). National Science Education Standards. Washington, D. C.: National Academy Press.

----------------------------------------------------------------------