APA aipamena

Ernst, C. H. (1989). Turtles of the world. Smithsonian Institution.

Chicago Style aipamena

Ernst, Carl H. Turtles of the World. Smithsonian Institution, 1989.

MLA aipamena

Ernst, Carl H. Turtles of the World. Smithsonian Institution, 1989.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.