1. APHA (1995). Standard Methods for the Examination of Water and Wasterwate. 19th, ed. American Public Health Association, Washingten DC, USA
2. Awalla C O, Ezeigbo H I (2002). An appraisal of water quality in the Uburu-Okposi area, Ebonyi State, southeastern Nigeria. Water Res, 13: 33–39
3. Bhandari A, Surampalli R, Champagne P, Ong S K, Lo I (2007). Remediation Technologies for Soil and Groundwater. American Society of Civil Engineers, Reston, USA, 2007
4. BRGM (2001). Management of mining, quarrying and ore-processing waste in the European Union. BRGM Report 50319-FR
5. Brown E, Skougslad M W, Fishman M J (1970). Methods for collection and analysis of water samples for dissolved minerals and gases. Techniques for Water Resources Investigations, Book 5, US Geological Survey