APA (7th ed.) Citation

3G E-Learning LLC, USA. (2019). Environmental issues: Pollution. 3G E-Learning.

Chicago Style (17th ed.) Citation

3G E-Learning LLC, USA. Environmental Issues: Pollution. New York: 3G E-Learning, 2019.

MLA (9th ed.) Citation

3G E-Learning LLC, USA. Environmental Issues: Pollution. 3G E-Learning, 2019.