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Dyfyniad Arddull ChicagoPAREEK UDAI. ROLE EFFECTIVENESS. NEW DELHI: LEARNING SYSTEMS, 1975.
Dyfyniad MLAPAREEK UDAI. ROLE EFFECTIVENESS. LEARNING SYSTEMS, 1975.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.