Não informado. (1971). American birds. National Audubon Society.
Lua i Stíl Chicago (17ú heag.)Não informado. American Birds. New York: National Audubon Society, 1971.
Lua MLA (8ú heag.)Não informado. American Birds. National Audubon Society, 1971.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.