एपीए उद्धरण

Karpagam, M. (2006). Environmental economics: A text book. Sterling publishers.

शिकागो स्टाइल उद्धरण

Karpagam, M. Environmental Economics: A Text Book. New Delhi: Sterling publishers, 2006.

एमएलए उद्धरण

Karpagam, M. Environmental Economics: A Text Book. Sterling publishers, 2006.