"Chew Men Leong"(PDF). Singapore International Water Week 1–5 June 2014. Archived from the original(PDF) on 1 February 2014. Retrieved 5 December 2013.
"Chew Men Leong"(PDF). Singapore International Water Week 1–5 June 2014. Archived from the original(PDF) on 1 February 2014. Retrieved 5 December 2013.