APA aipamena

British Trust for Ornithology. Bird study: Bird study (Online). Thetford, Norfolk, UK: British Trust for Ornithology.

Chicago Style aipamena

British Trust for Ornithology. Bird Study: Bird Study (Online). Thetford, Norfolk, UK: British Trust for Ornithology.

MLA aipamena

British Trust for Ornithology. Bird Study: Bird Study (Online). Thetford, Norfolk, UK: British Trust for Ornithology.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.