Dyfyniad APA

National research council. (1996). National science education standards. National Academy press.

Dyfyniad Arddull Chicago

National research council. National Science Education Standards. United States: National Academy press, 1996.

Dyfyniad MLA

National research council. National Science Education Standards. National Academy press, 1996.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.