Dawit, A. ., W. . Teklu, T. . Birhanu, and K. . Aliye. “Participatory Evaluation and Demonstration of Urea Treatment of Straws in Sinana Districts of Bale Highlands Southeastern Ethiopia”. Scientific Journal of Crop Science, vol. 4, no. 6, Dec. 2015, pp. 54-59, http://sjournals.com/index.php/sjcs/article/view/337.