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Dyfyniad Arddull ChicagoNational Science Teachers Association. Environmental Inquiry Leadership Team, Inc ebrary, and Nancy M. Trautmann. Decay and Renewal. Teacher ed. Arlington, Va.: NSTA Press, 2003.
Dyfyniad MLANational Science Teachers Association. Environmental Inquiry Leadership Team, et al. Decay and Renewal. Teacher ed. NSTA Press, 2003.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.