APA (7th ed.) Zitazioa
Montgomery, D. R. (2007). Dirt: The erosion of civilizations. University of California Press.
Chicago Style (17th ed.) Zitazioa
Montgomery, David R. Dirt: The Erosion of Civilizations. Berkeley: University of California Press, 2007.
MLA (9th ed.) Zitazioa
Montgomery, David R. Dirt: The Erosion of Civilizations. University of California Press, 2007.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.