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Dyfyniad Arddull ChicagoKoran, John J. A Summary of Research in Science Education for the Years of 1968-69 College Level Science. Ohio, Estados Unidos: ERIC, 1972.
Dyfyniad MLAKoran, John J. A Summary of Research in Science Education for the Years of 1968-69 College Level Science. ERIC, 1972.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.