APA
Conkin Paul K,, . (2007). The state of the earth : Environmental challenges on the road to 2100. Washington D C: University Press Of Kentucky.
Chicago
Conkin Paul K,, . 2007. The state of the earth : Environmental challenges on the road to 2100. Washington D C: University Press Of Kentucky.
Harvard
Conkin Paul K,, . (2007). The state of the earth : Environmental challenges on the road to 2100. Washington D C: University Press Of Kentucky.
MLA
Conkin Paul K,, . The state of the earth : Environmental challenges on the road to 2100. Washington D C: University Press Of Kentucky. 2007.