APA (7th ed.) Zitazioa
Tortell, P. (2020). Earth 2020: An insider's guide to a rapidly changing planet. Open Book Publishers.
Chicago Style (17th ed.) Zitazioa
Tortell, Philippe. Earth 2020: An Insider's Guide to a Rapidly Changing Planet. Cambridge, England: Open Book Publishers, 2020.
MLA (9th ed.) Zitazioa
Tortell, Philippe. Earth 2020: An Insider's Guide to a Rapidly Changing Planet. Open Book Publishers, 2020.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.