1. Lead The Facts;Thornton,2001
2. Phasing out lead from gasoline: worldwide experience and policy implications, Pollution Management Series;Lovei,1997
3. Nordic Council of Ministers, Lead Review, 2003, available in http://www.who.int/ifcs/documents/forums/forum5/nmr_lead.pdf, last consulted August 12, 2010.
4. ILZSG (International Lead and Zinc Study Group), Lead and Zinc Statistics, 2007, available in www.ilzsg.org, last consulted February 4, 2010.
5. Changing patterns in global lead supply and demand;Roberts;J. Power Sources,2003