Não informado. (1987). Journal of Petroleum Science & Engineering. Editions Elsevier.
Lua i Stíl Chicago (17ú heag.)Não informado. Journal of Petroleum Science & Engineering. Amsterdam: Editions Elsevier, 1987.
Lua MLA (8ú heag.)Não informado. Journal of Petroleum Science & Engineering. Editions Elsevier, 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.