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Dyfyniad Arddull ChicagoAli, Ridwan, Yusuf A. Choudhry, and Douglas W. Lister. Sri Lanka's Tea Industry: Succeeding in the Global Market. Washington D C: World Bank, 1997.
Dyfyniad MLAAli, Ridwan, et al. Sri Lanka's Tea Industry: Succeeding in the Global Market. World Bank, 1997.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.