APA (7th ed.) Zitazioa
Zimdahl, R. L. (2006). Agriculture's ethical horizon. Academic Press.
Chicago Style (17th ed.) Zitazioa
Zimdahl, Robert L. Agriculture's Ethical Horizon. Amsterdam ; Boston: Academic Press, 2006.
MLA (9th ed.) Zitazioa
Zimdahl, Robert L. Agriculture's Ethical Horizon. Academic Press, 2006.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.