Hassen Abbadiko, Getahun, and Getachew Mulugeta. “Sustainable Agriculture: Agroforestry for Soil Fertility and Food Security”. Journal of Equity in Sciences and Sustainable Development , vol. 2, no. 1, Jan. 2018, pp. 44-53, https://www.jessdmwu.edu.et/MWU/index.php/files/article/view/51.