Não informado. (1960). The Mining Engineer. Institution of Mining Engineers.
Lua i Stíl Chicago (17ú heag.)Não informado. The Mining Engineer. London: Institution of Mining Engineers, 1960.
Lua MLA (8ú heag.)Não informado. The Mining Engineer. Institution of Mining Engineers, 1960.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.