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Dyfyniad Arddull ChicagoOMS. WHO Technical Report Series; N.830: The Control of Schistosomiasis. Geneva: OMS, 1993.
Dyfyniad MLAOMS. WHO Technical Report Series; N.830: The Control of Schistosomiasis. Geneva: OMS, 1993.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.