Não informado. Pipeline underground utilities construction. Oildom Publishing.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Pipeline Underground Utilities Construction. Houston, Tex: Oildom Publishing.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Pipeline Underground Utilities Construction. Oildom Publishing.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.