1. Castleman BI. Asbestos: Medical and Legal Aspects. 4th ed. New Jersey: Aspen Law and Business Books, 1996.
2. Council for Scientific and Industrial Research. Field Survey in the North Western Cape and at Penge in the Transvaal (Asbestosis and Mesothelioma). Report No. 1/64. Pneumoconiosis Research Unit, Johannesburg, 1964.
3. Felix MA. Environmental Asbestos and Respiratory Disease in South Africa. PhD thesis, University of the Witwatersrand, 1997.
4. Hall AL. Asbestos in the Union of South Africa. Geological Survey Memoir No 12, Pretoria, 1918.