Não informado. (2011). U.S. Geological Survey Bulletin. U.S. Department of the Interior, Geological Survey.
Lua i Stíl Chicago (17ú heag.)Não informado. U.S. Geological Survey Bulletin. Washington: U.S. Department of the Interior, Geological Survey, 2011.
Lua MLA (8ú heag.)Não informado. U.S. Geological Survey Bulletin. U.S. Department of the Interior, Geological Survey, 2011.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.