Obua, J., G. . Muhanguzi, and T. . Raussen. “On-Farm Tree Planting and Tree Diversity in the Kigezi Highlands and Mabira Buffer Zones”. Uganda Journal of Agricultural Sciences, vol. 6, no. 1, Jan. 2001, pp. 7-12, http://journal.naro.go.ug/index.php/ujas/article/view/416.