Dwipa, I., . Yusniwati, and R. S. Hirza. “Effect of Ferrous Iron Stress to West Sumatera Paddy Rice (Oryza Nivara) Growth on Nutrient Culture Media”. Asian Journal of Research in Crop Science, Vol. 5, no. 4, Sept. 2020, pp. 17-23, doi:10.9734/ajrcs/2020/v5i430101.