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Citação do estilo Chicago (17ª ed.)Association for the Environmental Health of Soils. Journal of Soil Contamination. Boca Raton, Fla: Lewis Publishers, 1999.
Citação MLA (8ª ed.)Association for the Environmental Health of Soils. Journal of Soil Contamination. Lewis Publishers, 1999.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.