(1972). Vol. 70, № 20; OiL and Gas journal. 1972.
Lua i Stíl Chicago (17ú heag.)Vol. 70, № 20; OiL and Gas Journal. 1972, 1972.
Lua MLA (9ú heag.)Vol. 70, № 20; OiL and Gas Journal. 1972, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.