REFERENCES
- Richter (C F). Elementary Seismology. 1958. W.H. Freeman & Company, San Francisco.
- Jeffreys (H) & Bullen (K E). Seismological Tables. 1940. British Association, Gray-Milne Trust, London.
- Bullen (K E). An Introduction to the Theory of Seismology. 1963. University Press, Cambridge.