Cita APA (7a ed.)

Conkin, P. K. (2007). The State of the Earth: Environmental Challenges on the Road to 2100. University Press of Kentucky.

Cita Chicago Style (17a ed.)

Conkin, Paul Keith. The State of the Earth: Environmental Challenges on the Road to 2100. Lexington, Ky.: University Press of Kentucky, 2007.

Cita MLA (8a ed.)

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