[1] Time Ball—Fort Canning, Singapore - Time Signals on Waymarking.com (2017-12-02 18:28:55 +09:00) http://www.waymarking.com/waymarks/WMFQ93_Time_BallFort_Canning_Singapore

[2] Fort Canning Lighthouse - Wikipedia (2017-11-18 18:29:08 +09:00) https://en.wikipedia.org/wiki/Fort_Canning_Lighthouse