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Dyfyniad Arddull ChicagoSingh, R R. Labour Economics. Agra: Sri Ram Mehra and company, 1971.
Dyfyniad MLASingh, R R. Labour Economics. Sri Ram Mehra and company, 1971.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.