1. Pigments for paint;Abel,2000
2. Dictionary of Important Chemicals;Ayres,1998
3. Safety of toys – part 3: migration of certain elements;BSI,1995
4. Recommendations for Identifying And Controlling Lead Paint On Public Playground Equipment;Consumer Product Safety Commission,1996
5. Friction and impact surfaces: are they lead-based paint hazards?;Dixon;J. Occup. Environ. Hyg.,2007