Não informado. (1990). Metals & Minerals Annual Review. Mining Journal.
Lua i Stíl Chicago (17ú heag.)Não informado. Metals & Minerals Annual Review. London: Mining Journal, 1990.
Lua MLA (8ú heag.)Não informado. Metals & Minerals Annual Review. Mining Journal, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.