Dejene Kebede, and TK Das. “Appraisal of Species-Wise Weed Distribution and Critical Period of Weed Competition in Sorghum at Kolladiba, North Gondar”. Pest Managment Journal of Ethiopia, vol. 10, Mar. 2023, pp. 69-76, https://ppseonlinejournal.org/index.php/PMJE/article/view/255.