1. J.T. Kummer, N. Weber, U.S. Patent 3,413,150 (1968).
2. Chloride Silent Power Limited, Sodium Sulfur Electric Vehicle Battery Engineering Program, DOE, report, DE-AC04-88AL54303, 1993.
3. Development of Sodium-Sulfur Batteries
4. Research on sodium sulfur battery for energy storage
5. The Sodium Sulfur Battery;Sudworth,1985