1. International Task Force on High Intensity Winds on Transmission Lines, Proc. Workshops, Buenos Aires, 1993, Brisbane, 1995.
2. T.T. Fujita, Tornadoes around the World, Weatherwise 56 (1973) 56–62, 78–83.
3. Tornado Activity in South Africa;Milford;J. South African Inst. Civil Engrs.,1994
4. R.V. Milford, A.M. Goliger, High intensity local winds due to severe thunderstorm events, Internal Report BE123, Materials & Structures Programme, Boutek, CSIR, February 1996.
5. NOAA, Tornadoes, nature's most violent storms. US Department of Commerce, National Oceanic and Atmospheric Administration, September 1992.