Ngowi, N. J., and A. G. Mwakaje. “Implementation Effects of Incentive Policies on Tanzanian Wetland Ecosystems”. Kasetsart Journal of Social Sciences, vol. 41, no. 1, Dec. 2019, pp. 83–90, https://so04.tci-thaijo.org/index.php/kjss/article/view/229975.