Cita APA (7th ed.)
National Geographic Society. (2006). Anfibios (1̊ ed.). National Geographic Society ; Weldon Owen Pty Ltd.
Cita Chicago (17th ed.)
National Geographic Society. Anfibios. 1̊ ed. National Geographic Society ; Weldon Owen Pty Ltd, 2006.
Cita MLA (9th ed.)
National Geographic Society. Anfibios. 1̊ ed. National Geographic Society ; Weldon Owen Pty Ltd, 2006.
Atenció: Aquestes cites poden no estar 100% correctes.