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Dyfyniad Arddull ChicagoMiguel, Edward, and Michael Kremer. Worms: Education and Health Externalities in Keyna. Cambridge: National Bureau of Economic Research, 2001.
Dyfyniad MLAMiguel, Edward, and Michael Kremer. Worms: Education and Health Externalities in Keyna. National Bureau of Economic Research, 2001.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.