Callan, S., & Thomas, J. M. (2013). Environmental economics & management: Theory, policy, and applications (6th ed.). South-Western Cengage Learning.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCallan, Scott, और Janet M. Thomas. Environmental Economics & Management: Theory, Policy, and Applications. 6th ed. Australia: South-Western Cengage Learning, 2013.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCallan, Scott, और Janet M. Thomas. Environmental Economics & Management: Theory, Policy, and Applications. 6th ed. South-Western Cengage Learning, 2013.
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