U.S. Environmental Protection Agency. Profile of the petroleum refining industry.
Lua i Stíl Chicago (17ú heag.)U.S. Environmental Protection Agency. Profile of the Petroleum Refining Industry.
Lua MLA (9ú heag.)U.S. Environmental Protection Agency. Profile of the Petroleum Refining Industry.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.