1. Lee's Building Maintenance Management;Wordsworth,2001
2. The SPAB Manifesto London:;Morris;Society for Protection of Ancient Building. (SPAB),1877
3. Hamilton, B., & Wan Salleh, M. (2001). Maintenance of Building Important. Retrieved from http://www.hba.org.my/news/2001/601/maintenance.htm.
4. Abdullah Ahmad Badawi (2007). Billions wasted in repairing buildings. Retrieved from http://www.hot-scrrensaver.com/2006/02/20/billions-wasted-in-repairing-public-buildings-and-amenities.