Al-Shamma’a, A., and R. A. Hassan. “Pollution Assessment of Surface and Drainage Water by Heavy Elements in Al Ahrar District, Wasit Governorate, Iraq”. Iraqi Journal of Science, Vol. 59, no. 2B, May 2018, pp. 886-91, https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/326.