YOHANNES YIHDEGO. The Move from Safe Yield to Sustainability and Manage Yield. Global Journal of Human-Social Science, [S. l.], v. 17, n. B1, p. 25–30, 2017. Disponível em: https://socialscienceresearch.org/index.php/GJHSS/article/view/1950. Acesso em: 4 may. 2024.