APA (7th ed.) Zitazioa
Owen, O. S. (1980). Natural resource conservation: An ecological approach (3rd ed.). Macmillan.
Chicago Style (17th ed.) Zitazioa
Owen, Oliver S. Natural Resource Conservation: An Ecological Approach. 3rd ed. London: Macmillan, 1980.
MLA (9th ed.) Zitazioa
Owen, Oliver S. Natural Resource Conservation: An Ecological Approach. 3rd ed. Macmillan, 1980.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.