APA
Chen H., National Bureau of Economic Research & Whalley J. (2011). The WTO government procurement agreement and its impacts on trade. Cambridge: NBER.
Chicago
Chen Hejing, National Bureau of Economic Research and Whalley John. 2011. The WTO government procurement agreement and its impacts on trade. Cambridge: NBER.
Harvard
Chen H., National Bureau of Economic Research and Whalley J. (2011). The WTO government procurement agreement and its impacts on trade. Cambridge: NBER.
MLA
Chen Hejing, National Bureau of Economic Research and Whalley John. The WTO government procurement agreement and its impacts on trade. Cambridge: NBER. 2011.