एपीए उद्धरण

Callan, S. J., & Scott J. Callan; Janet M. Thomas. Environmental economics and management: Theory, policy and applications. United States: South-Western,Thomson Learning.

शिकागो स्टाइल उद्धरण

Callan, Scott J., और Scott J. Callan; Janet M. Thomas. Environmental Economics and Management: Theory, Policy and Applications. United States: South-Western,Thomson Learning.

एमएलए उद्धरण

Callan, Scott J., और Scott J. Callan; Janet M. Thomas. Environmental Economics and Management: Theory, Policy and Applications. United States: South-Western,Thomson Learning.