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Dyfyniad Arddull ChicagoSharma, C.K, and M.K Jain. Research Methodology. New Delhi: Shree publishers, 2009.
Dyfyniad MLASharma, C.K, and M.K Jain. Research Methodology. Shree publishers, 2009.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.