Gray, N. F. (2005). Water technology: An introduction for environmental scientists and engineers (Second edition.). Elsevier/Butterworth-Heinemann.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGray, N. F. Water Technology: An Introduction for Environmental Scientists and Engineers. Second edition. Oxford: Elsevier/Butterworth-Heinemann, 2005.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGray, N. F. Water Technology: An Introduction for Environmental Scientists and Engineers. Second edition. Elsevier/Butterworth-Heinemann, 2005.
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