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Citação do estilo Chicago (17ª ed.)International Society for Environmental Epidemiology. Epidemiology. Baltimore, Md: Williams & Wilkins, 1990.
Citação MLA (8ª ed.)International Society for Environmental Epidemiology. Epidemiology. Williams & Wilkins, 1990.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.