APA (7th ed.) Zitazioa
Morgan, R. P. C. (2005). Soil Erosion (3rd ed.). Blackwell.
Chicago Style (17th ed.) Zitazioa
Morgan, R. P. C. Soil Erosion. 3rd ed. Malden, MA: Blackwell, 2005.
MLA (9th ed.) Zitazioa
Morgan, R. P. C. Soil Erosion. 3rd ed. Blackwell, 2005.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.