Cita APA (7th ed.)

3G E-learning LLC, USA. (2019). Environmental issues: Ecological footprints. 3G E-learning LLC.

Cita Chicago (17th ed.)

3G E-learning LLC, USA. Environmental Issues: Ecological Footprints. New York, NY: 3G E-learning LLC, 2019.

Cita MLA (9th ed.)

3G E-learning LLC, USA. Environmental Issues: Ecological Footprints. 3G E-learning LLC, 2019.