APA (7th ed.) Zitazioa

American Geographical Society's Focus on Geography. Wiley-Blackwell.

Chicago Style (17th ed.) Zitazioa

American Geographical Society's Focus on Geography. Wiley-Blackwell.

MLA (9th ed.) Zitazioa

American Geographical Society's Focus on Geography. Wiley-Blackwell.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.