1. Checkland, P., and Holwell, S.: ‘Information, systems and information systems’, (Wiley Chichester 1998)
2. Deighton, L.: ‘Fighter: the true story of the Battle of Britain’, (Cape London 1977)
3. Wood, D.: ‘The narrow margin: the battle of Britain and the rise of air power 1930–1940’, (Arrow books London 1969),revised edition
4. Hall, A.D.: ‘Metasystems methodology: a new synthesis and unification’, (Pergamon Oxford 1989)
5. Middlebrook, M.: ‘The Berlin raids’, (Penguin Books Harmondsworth 1990)