Bangura, K., S. H. M. Aikins, W. Dogbe, and C. S. Kamara. “Effects of Tillage and Weeding Frequency on Rice Yield and Yield Components”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 28, no. 2, July 2016, pp. 141-50, https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/5921.