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Dyfyniad Arddull ChicagoKanis, Ira B., and Warren E. Yasso. Earth Science Activities: A Guide to Effective Elementary School Science Teaching. Boston: Allyn and Bacon, 1996.
Dyfyniad MLAKanis, Ira B., and Warren E. Yasso. Earth Science Activities: A Guide to Effective Elementary School Science Teaching. Allyn and Bacon, 1996.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.