1. Annoni, A. (2000). The project GI&GIS a key action of the EC Joint Research Centre to support the creation of a European Geographic Information Infrastructure. Proceedings of Global Spatial Data Infrastructure (GSDI) Conference 2000. Available: http://www.gsdi.org/docs.html
2. BS7666: Part 1 specification for a street gazetteer,1993
3. BS7666: Part 2 specification for a land and property gazetteer,1994
4. BS7666: Part 3 specification for addresses,1994
5. BS7666: Part 4 specification of a data-set for recording public rights of way,1996