(1973). Vol. 71, № 22; OiL and Gas journal. 1973.
Lua i Stíl Chicago (17ú heag.)Vol. 71, № 22; OiL and Gas Journal. 1973, 1973.
Lua MLA (9ú heag.)Vol. 71, № 22; OiL and Gas Journal. 1973, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.