1. World Health Organization. Elimination of asbestos related dis-eases. Geneva, Switzerland: WHO, 2006.
2. World Health Organization. Environmental Health Criteria 53: Asbestos and Other Natural Mineral Fibres. Geneva, Switzer-land: WHO, 1986.
3. World Health Organization. Environmental Health Criteria 203: Chyrsotile Asbestos. Geneva, Switzerland: WHO, 1998.
4. National Cancer Institute. Factsheet-Asbestos: Questions and Answers. Bethesda, MD: National Institutes of Health, 2003.