BRIGGS, D. (1981). Sources and methods in geogaphy: Soils. Butterworths.
Lua i Stíl Chicago (17ú heag.)BRIGGS, David. Sources and Methods in Geogaphy: Soils. London: Butterworths, 1981.
Lua MLA (9ú heag.)BRIGGS, David. Sources and Methods in Geogaphy: Soils. Butterworths, 1981.
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