1. For example, see Organisation for Economic Cooperation and Development (OECD), The Environmental Effects of Trade (Paris, OECD, 1994).
2. World Bank Discussion Paper no. 159,1992
3. See H. G. Baharuddin and M. Simula, Certification Systems of All Timber and Timber Products (Yokohama: ITTO, 1994).
4. For example, see London Environmental Economic Centre (LEEC), The Economic Linkages between the International Trade in Tropical Timber and the Sustainable Management of Tropical Forests, ITTO Activity PCM(XI)/4 (London: ITTO, 1993).
5. UNCTAD, “The Effects of the Internalization of External Costs on Sustainable Development”, TD/B/40(2)/6, 1994.