Cita APA (7th ed.)

Karpagam, M. (1999). Environmental economics: A textbook. Sterling Publishers.

Cita Chicago (17th ed.)

Karpagam, M. Environmental Economics: A Textbook. New Delhi: Sterling Publishers, 1999.

Cita MLA (9th ed.)

Karpagam, M. Environmental Economics: A Textbook. Sterling Publishers, 1999.