(1994). Field Guide To The Birds Of North America. National Geographic society.
Lua i Stíl Chicago (17ú heag.)Field Guide To The Birds Of North America. National Geographic society, 1994.
Lua MLA (8ú heag.)Field Guide To The Birds Of North America. National Geographic society, 1994.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.