1. Ashurst, J. and Ashurst, N. (1988), Practical Building Conservation: Stone Masonry: English Heritage Technical Handbook, Vol. 1, Gower Technical Press, Avon.
2. Bell, D. (1997), Technical Advice Note 8: The Historic Scotland Guide to International Charters, HMSO, Edinburgh.
3. Burman, P. (1995), A Question of Ethics, available at: www.buildingconservation.com/articles/ethics/ethics.htm (accessed July 2009).
4. Burra Charter (1999), International Charters for the Conservation and Restoration of Monuments and Sites, ICOMOS.
5. BS 7913 (1998), The Principles of the Conservation of Historic Buildings, BSI, London.