1. An overview of Southern African PGM smelting;Jones,2005
2. Forecasting Platinum Supply and Demandhttps://www.platinuminvestment.com/files/Platinum_Fundamentals_forecast_Glaux_2016.pdf
3. Platinum 2012http://www.platinum.matthey.com/publications/pgm-market-reviews/market-review-archive/platinum-2012
4. Platinum Mining Supply Predicted to Fall Further in 2017. World Platinum Investment Council Press Release, 15 May 2017, 1–3https://www.platinuminvestment.com/files/224537/WPIC_PR_PQ%20Q1%202017_15052017.pdf
5. International Platinum Group Metals Association Fact Sheet, 1–7http://ipa-news.com/assets/sustainability/Primary%20Production%20Fact%20Sheet_LR.pdf