Não informado. (2001). Western oil and refining. Palmer Publications.
Lua i Stíl Chicago (17ú heag.)Não informado. Western Oil and Refining. Los Angeles, Calif: Palmer Publications, 2001.
Lua MLA (8ú heag.)Não informado. Western Oil and Refining. Palmer Publications, 2001.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.