Não informado. World environment report. Center for International Environment Information.
Lua i Stíl Chicago (17ú heag.)Não informado. World Environment Report. New York: Center for International Environment Information.
Lua MLA (8ú heag.)Não informado. World Environment Report. Center for International Environment Information.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.