Ekwealor, K. U., C. B. Echereme, T. N. Ofobeze, and C. N. Okereke. “Economic Importance of Weeds: A Review”. Asian Plant Research Journal 3, no. 2 (December 13, 2019): 1-11. Accessed September 21, 2021. https://journalaprj.com/index.php/APRJ/article/view/30063.