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Dyfyniad Arddull ChicagoHarlan, Jean Durgin, and Mary S. Rivkin. Science Experiences for the Early Childhood Years: An Integrated Approach. 7th ed. Upper Saddle River, N.J: Merrill, 2000.
Dyfyniad MLAHarlan, Jean Durgin, and Mary S. Rivkin. Science Experiences for the Early Childhood Years: An Integrated Approach. 7th ed. Merrill, 2000.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.