APA (7th ed.) Zitazioa
Gillespie, A. (2007). Protected areas and international environmental law. Martinus Nijhoff Publishers.
Chicago Style (17th ed.) Zitazioa
Gillespie, Alexander. Protected Areas and International Environmental Law. Leiden ; Boston: Martinus Nijhoff Publishers, 2007.
MLA (9th ed.) Zitazioa
Gillespie, Alexander. Protected Areas and International Environmental Law. Martinus Nijhoff Publishers, 2007.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.