APA aipamena

Scheffer, V. B. Seals sealions and walruses.

Chicago Style aipamena

Scheffer, Victor B. Seals Sealions and Walruses.

MLA aipamena

Scheffer, Victor B. Seals Sealions and Walruses.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.