1. Ansoff, I. (1987), Corporate Strategy, Penguin Books, Harmondsworth.
2. Argenti, J. (1968), Corporate Planning: A Practical Guide, George Allen & Unwin, London.
3. Argenti, J. (1980), Practical Corporate Planning, George Allen & Unwin, London.
4. Bowman, C. and Asch, D. (1996), Managing Strategy, Macmillan Press, London.
5. Brooks, I. and Weatherston, J. (2000), The Business Environment: Challenges and Changes, Reardon Educational Ltd, Harlow.