National research council. (1996). National science education standards. National Academy press.
Chicago-čujuhus (17. p.)National research council. National Science Education Standards. United States: National Academy press, 1996.
MLA-čujuhus (9. p.)National research council. National Science Education Standards. National Academy press, 1996.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.