Lua APA (7ú heag.)

Birkeland, P. W. (1999). Soils and geomorphology (3rd ed.). Oxford University Press.

Lua i Stíl Chicago (17ú heag.)

Birkeland, Peter W. Soils and Geomorphology. 3rd ed. New York: Oxford University Press, 1999.

Lua MLA (9ú heag.)

Birkeland, Peter W. Soils and Geomorphology. 3rd ed. Oxford University Press, 1999.

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