Elbers, Chris and Cees Withagen. "Environmental Policy, Population Dynamics and Agglomeration" Contributions in Economic Analysis & Policy, 3.2 (2003): -. Retrieved 20 May. 2013, from doi:10.2202/1538-0645.1286

Elbers, C. & Withagen, C. (2003). Environmental Policy, Population Dynamics and Agglomeration. Contributions in Economic Analysis & Policy, 3(2), pp. -. Retrieved 20 May. 2013, from doi:10.2202/1538-0645.1286

Elbers, Chris and Cees Withagen. 2003. Environmental Policy, Population Dynamics and Agglomeration. Contributions in Economic Analysis & Policy. 3(2): -. Retrieved 20 May. 2013, from doi:10.2202/1538-0645.1286