1. Amberg & TTI (2004) Final geotechnical interpretative report CCL824 - reconstruction of Braced Excavation System Project document.
2. Bell B.C. & Chiew S.P. (2006). "Nicoll Highway collapse: Some structural observations. Part 2: Soil retention system." Proc. Int. Conf. on Deep Excavations Singapore June 2006.
3. Material characterization of Singapore Marine Clayat Changi
4. COI (2005). Report of the Committee of Inquiry into the Incident at the MRT Circle Line Worksite that Led to the Collapse of Nicoll Highway 20 April 2004. Report Submitted to the Minister of Manpower.