Borup, M. B., & Middlebrooks, E. J. (1987). Pollution control in the petrochemicals industry. Lewis Publishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBorup, M. Brett, और E. Joe Middlebrooks. Pollution Control in the Petrochemicals Industry. Chelsea, Mich: Lewis Publishers, 1987.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBorup, M. Brett, और E. Joe Middlebrooks. Pollution Control in the Petrochemicals Industry. Lewis Publishers, 1987.