Butler, Alison. "Environmental Protection and Free Trade : Are They Mutually Exclusive?," in Federal Reserve Bank of St. Louis. "May/June 1992," Review (Federal Reserve Bank of St. Louis) (May/June 1992) : 4-17. https://fraser.stlouisfed.org/title/820/item/24553/toc/499964 , accessed on April 24, 2024.