Todd, D. K. (1980). Groundwater hydrology (2nd ed.). Wiley.
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Dyfyniad Arddull Chicago
Todd, David Keith. Groundwater Hydrology. 2nd ed. New York: Wiley, 1980.
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Dyfyniad MLA
Todd, David Keith. Groundwater Hydrology. 2nd ed. Wiley, 1980.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.