APA (7th ed.) Zitazioa
National Geographic Society. (2006). Anfibios (1̊ ed.). National Geographic Society ; Weldon Owen Pty Ltd.
Chicago Style (17th ed.) Zitazioa
National Geographic Society. Anfibios. 1̊ ed. National Geographic Society ; Weldon Owen Pty Ltd, 2006.
MLA (9th ed.) Zitazioa
National Geographic Society. Anfibios. 1̊ ed. National Geographic Society ; Weldon Owen Pty Ltd, 2006.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.