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Dyfyniad Arddull ChicagoKothari, C.R. Research Methodology: Methods and Techniques. New Delhi: Wiley Eastern, 1985.
Dyfyniad MLAKothari, C.R. Research Methodology: Methods and Techniques. Wiley Eastern, 1985.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.