Cita APA (7th ed.)

Conkin, P. (2007). The state of the earth: Environmental challenges on the road to 2100. Universities Press.

Cita Chicago (17th ed.)

Conkin, Paul. The State of the Earth: Environmental Challenges on the Road to 2100. Hyderabad: Universities Press, 2007.

Cita MLA (9th ed.)

Conkin, Paul. The State of the Earth: Environmental Challenges on the Road to 2100. Universities Press, 2007.