1. AA, Financial Reports – Years 1999–2008. Sustainability Reports – Years 2002–2008, Anglo American Plc, London, UK/Johannesburg, South Africa.
2. AP, Financial Reports – Years 1999–2008. Sustainability Reports – Years 2002–2008, Anglo Platinum Ltd., Johannesburg, South Africa.
3. AqP, Financial Reports – Years 1997/98–2007/08. Sustainability Reports – Years 2005, 2007, Aquarius Platinum Ltd., Johannesburg, South Africa.
4. ARM, Financial Reports – Years 2002–2008. Sustainability Reports – Years 2007–2008, African Rainbow Minerals Ltd., Johannesburg, South Africa.
5. The geochemistry of acid mine drainage;Blowes;Treatise on Geochemistry,2007