Carin, A. A., & Sund, R. B. (1989). Guided discovery activities for elementary school science (2nd ed.). Merrill.
Dyfyniad Arddull ChicagoCarin, Arthur A., and Robert B. Sund. Guided Discovery Activities for Elementary School Science. 2nd ed. Columbus, Ohio: Merrill, 1989.
Dyfyniad MLACarin, Arthur A., and Robert B. Sund. Guided Discovery Activities for Elementary School Science. 2nd ed. Merrill, 1989.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.