Não informado. (1970). Pipeline and Gas Journal. Petroleum Engineer Publishing.
Lua i Stíl Chicago (17ú heag.)Não informado. Pipeline and Gas Journal. Dallas, Tex: Petroleum Engineer Publishing, 1970.
Lua MLA (8ú heag.)Não informado. Pipeline and Gas Journal. Petroleum Engineer Publishing, 1970.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.