Petersen, P, O, F, B, J, B, D, C, M, C, H.(2005).The Role of Customary Law in Sustainable Development .:Cambridge University Press.
Gaya MLA
Petersen, Peter, Orebech;, Fred, Bosselman;, Jes, Bjarup;, David, Callies;, Martin, Chanock;, Hanne."The Role of Customary Law in Sustainable Development".:Cambridge University Press,2005.Text.