(1968). Vol. 66, № 46; OiL and Gas journal. 1968.
Lua i Stíl Chicago (17ú heag.)Vol. 66, № 46; OiL and Gas Journal. 1968, 1968.
Lua MLA (9ú heag.)Vol. 66, № 46; OiL and Gas Journal. 1968, 1968.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.