Sarauta, A., A. Sabo, I. A. Abdulhamed, and Y. O. Yusuf. “Assessment of Persistent Organic Pollutants in Water Samples from River Challawa in Kano, Nigeria”. World Journal of Environmental Research, vol. 5, no. 2, Dec. 2015, pp. 159-77, doi:10.18844/wjer.v5i2.163.