Não informado. (1967). Minerals Yearbook. U.S. Department of the Interior, Bureau of Mines.
Lua i Stíl Chicago (17ú heag.)Não informado. Minerals Yearbook. Washington: U.S. Department of the Interior, Bureau of Mines, 1967.
Lua MLA (8ú heag.)Não informado. Minerals Yearbook. U.S. Department of the Interior, Bureau of Mines, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.