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Dyfyniad Arddull ChicagoPillai, CR, and CG Naidu. Economics of Distance Education: The IGNOU Experience. New Delhi: Indira Gandhi National Open Unoiversity, 1997.
Dyfyniad MLAPillai, CR, and CG Naidu. Economics of Distance Education: The IGNOU Experience. Indira Gandhi National Open Unoiversity, 1997.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.