Wagner, T. (2005). Environmental scienceActive learning laboratories and applied problem setsTravis Wagner, Robert Sanfortd. John Wiley.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWagner, Travis. Environmental ScienceActive Learning Laboratories and Applied Problem SetsTravis Wagner, Robert Sanfortd. John Wiley, 2005.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWagner, Travis. Environmental ScienceActive Learning Laboratories and Applied Problem SetsTravis Wagner, Robert Sanfortd. John Wiley, 2005.
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