APA (7th ed.) Citation

Duffy, R. J., & Opp, S. M. (2021). Environmental issues today: Choices and challenges. ABC-CLIO.

Chicago Style (17th ed.) Citation

Duffy, Robert J., and Susan M. Opp. Environmental Issues Today: Choices and Challenges. Santa Barbara, California: ABC-CLIO, 2021.

MLA (9th ed.) Citation

Duffy, Robert J., and Susan M. Opp. Environmental Issues Today: Choices and Challenges. ABC-CLIO, 2021.