Não informado. (1955). Earth science. American Geological Institute.
Lua i Stíl Chicago (17ú heag.)Não informado. Earth Science. Falls Church, Va: American Geological Institute, 1955.
Lua MLA (8ú heag.)Não informado. Earth Science. American Geological Institute, 1955.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.