एपीए उद्धरण

Callan, S. (1996). Environmental economics and managerment: Theory, policy, and applications. Chcago: Irwin.

शिकागो स्टाइल उद्धरण

Callan, Scott. Environmental Economics and Managerment: Theory, Policy, and Applications. Chcago: Irwin, 1996.

एमएलए उद्धरण

Callan, Scott. Environmental Economics and Managerment: Theory, Policy, and Applications. Chcago: Irwin, 1996.