Não informado. (2001). Statistical digest. U.S. Fish and Wildlife Service.
Lua i Stíl Chicago (17ú heag.)Não informado. Statistical Digest. Washington: U.S. Fish and Wildlife Service, 2001.
Lua MLA (8ú heag.)Não informado. Statistical Digest. U.S. Fish and Wildlife Service, 2001.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.