Miller, G. T., & Spoolman, S. E. (2013). Environmental science (14th ed.). Cengage Learning India Private Limited.

Miller, G. Tyler, and Scott E. Spoolman. Environmental Science. 14th ed. New Delhi: Cengage Learning India Private Limited, 2013.

Miller, G. Tyler, and Scott E. Spoolman. Environmental Science. 14th ed. Cengage Learning India Private Limited, 2013.