John Nyongesah, M., W. Quan, O. Dennis, and J. de la P. Mupenzi. “Interactive Effects of Livestock and Trees on Nutrients and Herbaceous Layer Production in a Humid Kenyan Savanna”. East African Journal of Science and Technology, vol. 1, no. 1, May 2011, doi:10.62103/unilak.eajst.1.1.25.