อ้างอิง ของ เดอรัม_(เทศมณฑล)

  1. 1 2 Boundary Commission for England (2007). Mapping for the Non-metropoltian Counties and Unitary Authorities; fifth periodical report. Boundary Commission for England. ISBN 0101703228.
  2. ↑ John Marius Wilson, Durham, Imperial Gazetteer of England and Wales, (1870-72). Retrieved 30 November 2007.
  3. ↑ Durham County Council - History and Heritage of County Durham. Retrieved 30 November 2007.

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