PETEX. (1982). Basic tools land equipment for the oil field - Petex. The universary of texas.
Lua i Stíl Chicago (17ú heag.)PETEX. Basic Tools Land Equipment for the Oil Field - Petex. The universary of texas, 1982.
Lua MLA (8ú heag.)PETEX. Basic Tools Land Equipment for the Oil Field - Petex. The universary of texas, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.