Conkin, P. (2007). The state of the earth: Environmental challenges on the road to 2100. Universities Press.
芝加哥风格引文Conkin, Paul. The State of the Earth: Environmental Challenges on the Road to 2100. Hyderabad: Universities Press, 2007.
MLA引文Conkin, Paul. The State of the Earth: Environmental Challenges on the Road to 2100. Universities Press, 2007.
警告：这些引文格式不一定是100％准确.