APA

Ibis^sthe quarterly journal of the british ornithologists. Inglaterra: British Ornithologists UNION.

Chicago

Ibis^sthe quarterly journal of the british ornithologists. Inglaterra: British Ornithologists UNION.

Harvard

Ibis^sthe quarterly journal of the british ornithologists. Inglaterra: British Ornithologists UNION.

MLA

Inglaterra: British Ornithologists UNION. .