Brady, N. C. (1984). The nature and properties of soils (9th ed.). Macmillan.
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Dyfyniad Arddull Chicago
Brady, Nyle C. The Nature and Properties of Soils. 9th ed. New York: Macmillan, 1984.
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Dyfyniad MLA
Brady, Nyle C. The Nature and Properties of Soils. 9th ed. Macmillan, 1984.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.