Não informado. (1999). United States Geological Survey Yearbook. U.S. Geological Survey.
Lua i Stíl Chicago (17ú heag.)Não informado. United States Geological Survey Yearbook. Washington: U.S. Geological Survey, 1999.
Lua MLA (8ú heag.)Não informado. United States Geological Survey Yearbook. U.S. Geological Survey, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.