1. American Association for the Advancement of Science (1993). Project 2061. Benchmarks for Science Literacy. New York: Oxford University Press.
2. Brady, S., and Willard, C. (1998). Microscopic Explorations: A GEMS Festival Guide. Great Explorations in Math and Science. Berkeley: Lawrence Hall of Science, University of California (rev. ed., 1999).
3. National Research Council (1995). National Science Education Standards. Washington, DC: National Academy Press.