Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (9th εκδ.)

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