Cita APA (7th ed.)

Thomas, J. M., & Callan,Scott. (2009). Environmental economics (India ed.). Cengage Learning.

Cita Chicago (17th ed.)

Thomas, Janet M., i Callan,Scott. Environmental Economics. India ed. New Dehli: Cengage Learning, 2009.

Cita MLA (8th ed.)

Thomas, Janet M., i Callan,Scott. Environmental Economics. India ed. Cengage Learning, 2009.