Não informado. (1926). Rocks and Minerals. Heldref Publications.
Lua i Stíl Chicago (17ú heag.)Não informado. Rocks and Minerals. Washington: Heldref Publications, 1926.
Lua MLA (8ú heag.)Não informado. Rocks and Minerals. Heldref Publications, 1926.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.