APA aipamena

Berta, A. (2015). Whales, Dolphins and porpoises.

Chicago Style aipamena

Berta, Annalisa. Whales, Dolphins and Porpoises. Ivy press, 2015.

MLA aipamena

Berta, Annalisa. Whales, Dolphins and Porpoises. 2015.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.