APA (7th ed.) Zitazioa

(1984). The Penguin book of bird poetry. Penguin.

Chicago Style (17th ed.) Zitazioa

The Penguin Book of Bird Poetry. Middlesex: Penguin, 1984.

MLA (9th ed.) Zitazioa

The Penguin Book of Bird Poetry. Penguin, 1984.