Não informado. (2010). Monographs of the United States Geological Survey. GPO.
Lua i Stíl Chicago (17ú heag.)Não informado. Monographs of the United States Geological Survey. Washington: GPO, 2010.
Lua MLA (8ú heag.)Não informado. Monographs of the United States Geological Survey. GPO, 2010.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.