1.Bennett, R., IsmaeBennett, R., Ismael, Y., Morse, S. and Shankar, B. 2004. ‘Reductions in insecticide use from adoption of Bt cotton in South Africa: Impacts on economic performance and toxic load to the environment’, The Journal of Agricultural Science, 142: 665–674.l, Y., Morse, S. and Shankar, B. 2004. ‘Reductions in insecticide use from adoption of Bt cotton in South Africa: Impacts on economic performance and toxic load to the environment’, The Journal of Agricultural Science, 142: 665–674.

2.Huang, J., Hu, R., Rozelle, S., Qiao, F. and Pray, C. 2002. ‘Transgenic varieties and productivity of small-holder cotton farmers in China’, Australian Journal of Agricultural and Resource Economics, 46: 367–387.

3.Kovach, J., Petzoldt, C., Degni, J. and Tette, J. ‘1992. A method to measure the environmental impact of pesticides’, in New York’s Food and Life Sciences Bulletin: New York State Agricultural Experiment Station, No. 139 (Ithaca: Cornell University, pp. 1–8)