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Dyfyniad Arddull ChicagoKothari. Yearbook on Business and Industry. Madras: Kothari and Kothari, 1998.
Dyfyniad MLAKothari. Yearbook on Business and Industry. Kothari and Kothari, 1998.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.