APA aipamena

Birkeland, P. W. Soils and geomorphology (3th ed.).

Chicago Style aipamena

Birkeland, Peter W. Soils and Geomorphology. 3th ed.

MLA aipamena

Birkeland, Peter W. Soils and Geomorphology. 3th ed.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.