5Copeland. Brian and Taylor. M. Cott:"North- south Trade And The Environment."Quartedy Joural of Economic, August 1994,109(3), Page775 - 87.
6Copeland. Brian and Taylor. M. Cott: "Trade and Trans Boundary Pollution. ", The American Economic Review, August 1995, 85(4), Page716- 37.
7Antweiler. Wemer, Gopeland. Brian. R and Taylor. M.Scott:"Is Free Trade Good For The Environment?", The American Eeonomic Review, September 2001, 91(4), Page877- 908.