1. A. E. R. Woodcock and M. Davis, Catastrophe Theory, Dutton, 1978.
2. Tim Poston and I. N. Stewart, Taylor Expansions and Catastrophes, Pitman, 1976.
3. An Introduction to Catastrophe Theory and Its Applications
4. Tim Poston and I. N. Stewart, Catastrophe Theory and its Applications, Pitman, 1978.