Não informado. (1981). Energy and minerals resources. Business Publishers.
Lua i Stíl Chicago (17ú heag.)Não informado. Energy and Minerals Resources. Silver Spring, Md: Business Publishers, 1981.
Lua MLA (8ú heag.)Não informado. Energy and Minerals Resources. Business Publishers, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.