APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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