WHALEN, B. (1981). Workbook for a primer of oilwell service and workover. Association of oilwell servicing contractors.
Lua i Stíl Chicago (17ú heag.)WHALEN, Bruce. Workbook for a Primer of Oilwell Service and Workover. Association of oilwell servicing contractors, 1981.
Lua MLA (8ú heag.)WHALEN, Bruce. Workbook for a Primer of Oilwell Service and Workover. Association of oilwell servicing contractors, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.