APA (7th ed.) Zitazioa
Penna, A. N. (2015). The human footprint: A global environmental history (Second edition.). Wiley Blackwell.
Chicago Style (17th ed.) Zitazioa
Penna, Anthony N. The Human Footprint: A Global Environmental History. Second edition. Chichester, [England]: Wiley Blackwell, 2015.
MLA (9th ed.) Zitazioa
Penna, Anthony N. The Human Footprint: A Global Environmental History. Second edition. Wiley Blackwell, 2015.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.