Pat Davies (March 2004). Sasol Gas-to-Liquids. 32nd Howard Weil Energy Conference. New Orleans: Sasol Petroleum International. Archived from the original(PDF) on 2011-02-15. Retrieved 2009-08-02.
Pat Davies (March 2004). Sasol Gas-to-Liquids. 32nd Howard Weil Energy Conference. New Orleans: Sasol Petroleum International. Archived from the original(PDF) on 2011-02-15. Retrieved 2009-08-02.