1. Our Fragile world: Challenges and opportunities for Sustainable development, Volume II, pp. 1329-1603, (2001) EOLSS Publishers Co. Ltd. Oxford, UK.
2. Vigneswaran S, Sundaravadivel M, Kandasamy J, Chaudhary D, Environmetal Management, pp. 3.1-3. 37 (2007), Scitech publication, Chennai, India.