Não informado. (2004). Refining engineer. Petroleum Engineer Publishing.
Lua i Stíl Chicago (17ú heag.)Não informado. Refining Engineer. Dallas, Tex: Petroleum Engineer Publishing, 2004.
Lua MLA (8ú heag.)Não informado. Refining Engineer. Petroleum Engineer Publishing, 2004.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.