1. First report of the Geological Survey of Natal and Zululand;Anderson,1901
2. Second report of the Geological Survey of Natal and Zululand;Anderson,1904
3. A reappraisal of the 40Ar/39Ar stepwise degassing technique;Brereton;Geophys. J. R Astron. Soc.,1972
4. The geology of South Africa;Corstophine,1905
5. Potassium-argon dating;Dalrymple,1969