Masters, G. M., & Ela, W. (2014). Introduction to environmental engineering and science (Third edition, International edition.). Pearson Education Limited.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMasters, Gilbert M., और Wendell Ela. Introduction to Environmental Engineering and Science. Third edition, International edition. England: Pearson Education Limited, 2014.
एमएलए (9वां संस्करण) प्रशस्ति पत्रMasters, Gilbert M., और Wendell Ela. Introduction to Environmental Engineering and Science. Third edition, International edition. Pearson Education Limited, 2014.
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