APA (7th ed.) Zitazioa
(1977). Environmental issues. John Wiley & Sons.
Chicago Style (17th ed.) Zitazioa
Environmental Issues. London: John Wiley & Sons, 1977.
MLA (9th ed.) Zitazioa
Environmental Issues. John Wiley & Sons, 1977.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.