National research council. (1996). National science education standards. National Academy press.
Chicago Style (17th ed.) ZitazioaNational research council. National Science Education Standards. United States: National Academy press, 1996.
MLA (9th ed.) ZitazioaNational research council. National Science Education Standards. National Academy press, 1996.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.