Não informado. (1973). International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts. Pergamon Press.
Lua i Stíl Chicago (17ú heag.)Não informado. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts. Oxford, Inglaterra: Pergamon Press, 1973.
Lua MLA (8ú heag.)Não informado. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts. Pergamon Press, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.