APA (7th ed.) Zitazioa

Earthquakes & Volcanoes. Superintendent of Documents.

Chicago Style (17th ed.) Zitazioa

Earthquakes & Volcanoes. Superintendent of Documents.

MLA (9th ed.) Zitazioa

Earthquakes & Volcanoes. Superintendent of Documents.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.