AIGBERUA, A. O., A. T. EKUBO, A. K. INENGITE, and S. C. IZAH. “Assessment of Some Selected Heavy Metals and Their Pollution Indices in an Oil Spill Contaminated Soil in the Niger Delta: A Case of Rumuolukwu Community”. Biotechnological Research, Vol. 3, no. 1, Mar. 2017, pp. 11-19, doi:10.15419/br.v3i1.740.