(1970). Vol. 68, № 38; OiL and Gas journal. 1970.
Lua i Stíl Chicago (17ú heag.)Vol. 68, № 38; OiL and Gas Journal. 1970, 1970.
Lua MLA (9ú heag.)Vol. 68, № 38; OiL and Gas Journal. 1970, 1970.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.