References
- The Statesman's Year‐Book 1987–88 , London : Macmillan .
- Whitaker's Almanack 1988 (London).
- The World Bank Atlas 1987 Washington, D.C.
- A Year Book of the Commonwealth 1987 , London : HMSO .
- Railway Directory & Yearbook 1988 , Sutton, Surrey : Railway Gazette International .
- The Times (newspaper) (London).
- The Economist, (weekly journal) London.