Não informado. (2009). Proceedings of the Annual Meeting. American Petroleum Institute.
Lua i Stíl Chicago (17ú heag.)Não informado. Proceedings of the Annual Meeting. New York: American Petroleum Institute, 2009.
Lua MLA (8ú heag.)Não informado. Proceedings of the Annual Meeting. American Petroleum Institute, 2009.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.