Não informado. (1982). Bibliography of Economic Geology. Geosystems Publications.
Lua i Stíl Chicago (17ú heag.)Não informado. Bibliography of Economic Geology. London: Geosystems Publications, 1982.
Lua MLA (8ú heag.)Não informado. Bibliography of Economic Geology. Geosystems Publications, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.