Conkin, P. (2007). The state of the earth: Environmental challenges on the road to 2100. Universities Press.
Chicago-referens (17:e uppl.)Conkin, Paul. The State of the Earth: Environmental Challenges on the Road to 2100. Hyderabad: Universities Press, 2007.
MLA-referens (9:e uppl.)Conkin, Paul. The State of the Earth: Environmental Challenges on the Road to 2100. Universities Press, 2007.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.