Não informado. (1972). Offshore services and technology. Spearhead Publications.
Lua i Stíl Chicago (17ú heag.)Não informado. Offshore Services and Technology. Surrey, Inglaterra: Spearhead Publications, 1972.
Lua MLA (8ú heag.)Não informado. Offshore Services and Technology. Spearhead Publications, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.