APA (7th ed.) Zitazioa
International Review for Environmental Strategies. Institute for Global Environmental Strategies.
Chicago Style (17th ed.) Zitazioa
International Review for Environmental Strategies. Institute for Global Environmental Strategies.
MLA (9th ed.) Zitazioa
International Review for Environmental Strategies. Institute for Global Environmental Strategies.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.