Não informado. (1975). Improved oil-recovery field reports. Society of Petroleum Engineers.
Lua i Stíl Chicago (17ú heag.)Não informado. Improved Oil-recovery Field Reports. Dallas, Tex: Society of Petroleum Engineers, 1975.
Lua MLA (8ú heag.)Não informado. Improved Oil-recovery Field Reports. Society of Petroleum Engineers, 1975.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.