Gans, Joshua S. "Do Voluntary Carbon Offsets Work?" The Economists' Voice, 4.4 (2007): -. Retrieved 24 May. 2013, from doi:10.2202/1553-3832.1256

Gans, J. (2007). Do Voluntary Carbon Offsets Work?. The Economists' Voice, 4(4), pp. -. Retrieved 24 May. 2013, from doi:10.2202/1553-3832.1256

Gans, Joshua S. 2007. Do Voluntary Carbon Offsets Work?. The Economists' Voice. 4(4): -. Retrieved 24 May. 2013, from doi:10.2202/1553-3832.1256