Langley, B. C. (1994). Refrigerant management: The recovery, recycling, and reclaiming of CFC's. Delmar.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLangley, Billy C. Refrigerant Management: The Recovery, Recycling, and Reclaiming of CFC's. Albany, NY: Delmar, 1994.
एमएलए (9वां संस्करण) प्रशस्ति पत्रLangley, Billy C. Refrigerant Management: The Recovery, Recycling, and Reclaiming of CFC's. Delmar, 1994.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.