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Dyfyniad Arddull ChicagoYager, Robert Eugene. Exemplary Science in Grades 9-12: Standards-based Success Stories. Arlington, Va.: NSTA Press, 2005.
Dyfyniad MLAYager, Robert Eugene. Exemplary Science in Grades 9-12: Standards-based Success Stories. NSTA Press, 2005.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.