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Lua i Stíl Chicago (17ú heag.)International Tunnelling Association. Advances in Tunnelling Technology and Subsurface Use. Oxford, Inglaterra: Pergamon Press, 1981.
Lua MLA (8ú heag.)International Tunnelling Association. Advances in Tunnelling Technology and Subsurface Use. Pergamon Press, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.