Yalden, D. W. The history of British birds. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Yalden, D. W. The History of British Birds. Oxford University Press.
Lua MLA (8ú heag.)Yalden, D. W. The History of British Birds. Oxford University Press.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.