National research council. (1996). National science education standards. National Academy press.
Lua i Stíl Chicago (17ú heag.)National research council. National Science Education Standards. United States: National Academy press, 1996.
Lua MLA (9ú heag.)National research council. National Science Education Standards. National Academy press, 1996.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.