Musyoka , M. M., and R. . Nalugala. “OVERVIEW OF ENVIRONMENTAL POLICY ON SAND HARVESTING AND ITS EFFECT TO THE SUSTAINABILITY OF RIVERS IN MAKUENI COUNTY”. African Journal of Emerging Issues, vol. 4, no. 1, Jan. 2022, pp. 1-17, https://ajoeijournals.org/sys/index.php/ajoei/article/view/249.