(1956). The petroleum engineer. [Petroleum Engineer Pub. Co..
Lua i Stíl Chicago (17ú heag.)The Petroleum Engineer. Dallas, Tex.: [Petroleum Engineer Pub. Co., 1956.
Lua MLA (8ú heag.)The Petroleum Engineer. [Petroleum Engineer Pub. Co., 1956.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.