APA (7th ed.) Zitazioa

(1989). Selected environmental law statutes 1989-90 educational edition. West Publishing.

Chicago Style (17th ed.) Zitazioa

Selected Environmental Law Statutes 1989-90 Educational Edition. West Publishing, 1989.

MLA (9th ed.) Zitazioa

Selected Environmental Law Statutes 1989-90 Educational Edition. West Publishing, 1989.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.