&quot; Trade and the Environment: The Issue of Transparency &quot; , en Markell y Knox, Greening NAFTA: The North American Commission for Environmental Cooperation (2003), 237-255
&quot; Trade and the Environment: The Issue of Transparency &quot; in Markell and Knox, edited, Greening NAFTA: The North American Commission for Environmental Cooperation, 237 - 255 (2003).