Não informado. (2003). Platts Energy Business & Technology. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Não informado. Platts Energy Business & Technology. New York: McGraw-Hill, 2003.
Lua MLA (8ú heag.)Não informado. Platts Energy Business & Technology. McGraw-Hill, 2003.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.