Cita APA (7th ed.)
Montgomery, D. R. (2007). Dirt: The erosion of civilizations. University of California Press.
Cita Chicago (17th ed.)
Montgomery, David R. Dirt: The Erosion of Civilizations. Berkeley: University of California Press, 2007.
Cita MLA (9th ed.)
Montgomery, David R. Dirt: The Erosion of Civilizations. University of California Press, 2007.
Atenció: Aquestes cites poden no estar 100% correctes.