Olmstead, Sheila M and Robert N Stavins. "A Meaningful Second Commitment Period for the Kyoto Protocol" The Economists' Voice, 4.3 (2007): -. Retrieved 22 May. 2013, from doi:10.2202/1553-3832.1230

Olmstead, S. & Stavins, R. (2007). A Meaningful Second Commitment Period for the Kyoto Protocol. The Economists' Voice, 4(3), pp. -. Retrieved 22 May. 2013, from doi:10.2202/1553-3832.1230

Olmstead, Sheila M and Robert N Stavins. 2007. A Meaningful Second Commitment Period for the Kyoto Protocol. The Economists' Voice. 4(3): -. Retrieved 22 May. 2013, from doi:10.2202/1553-3832.1230