Não informado. (1973). International petroleum abstracts. Institute of Petroleum.
Lua i Stíl Chicago (17ú heag.)Não informado. International Petroleum Abstracts. London: Institute of Petroleum, 1973.
Lua MLA (8ú heag.)Não informado. International Petroleum Abstracts. Institute of Petroleum, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.