Não informado. (1949). Petroleum Engineer International. Harcourt Brace Jovanovich Publications.
Lua i Stíl Chicago (17ú heag.)Não informado. Petroleum Engineer International. Dallas, Tex: Harcourt Brace Jovanovich Publications, 1949.
Lua MLA (8ú heag.)Não informado. Petroleum Engineer International. Harcourt Brace Jovanovich Publications, 1949.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.