1. Heavy metal pollutants in wastewater effluents: sources, effects and remediation;Akpor;Adv. Biosci. Bioeng.,2014
2. Heavy Metals In Water, 2014. http://doi.org/10.1039/9781782620174.
3. Biological effects of heavy metals: an overview;Sharma;J. Environ. Biol.,2005
4. Heavy metals toxicity and the environment;Tchounwou;EXS,2012
5. EUR-Lex - 31998L0083 - EN - EUR-Lex, (n.d.). http://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX%3A31998L0083 (accessed July 10, 2017).