References
- Allan, Ian. Motive Power Monthly (May 1991) ISSN 0952-2867
- Hartley, Peter; Bruckmann, Clive G. (2002). Business Communication. Routledge. ISBN 0-415-19550-0.
- Gourvish, Terence (2002). British Rail, 1974-97: From Integration to Privatisation. ISBN 0-19-926909-2.
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