Reference of task 4-6

1.building process of Tsing Ma bridge, RTHK - https://www.youtube.com/watch?v=i_19XlwnO9I
2.Sustainable Development in the Project Management of the Tsing Ma Bridge in Hong Kong, Ir Dr Lau, C.K. - http://www.psdas.gov.hk/content/doc/2003-2-6/20_Nov_Dr_C_K_Lau.pdf
3.The bridge engineering 2 conference, Polly Ng Pui Yu , Department of Civl Engineering, University of Bath, United Kingdom - http://www.bath.ac.uk/ace/uploads/StudentProjects/Bridgeconference2007/conference/mainpage/Ng_Tsing_Ma.pdf
4.Tsing Ma  Bridge, Highways Department Hong Kong - http://www.hyd.gov.hk/en/publications_and_publicity/publications/hyd_factsheets/doc/e_tsing_ma_bridge.pdf
5. Tsaing Ma bridge, structures - http://structurae.net/structures/tsing-ma-bridge
6. King of bridge Lau Ching Kong - http://qkzz.net/article/02ac677d-878b-4735-bbde-7c670e6ba8da.htm
7. Reinforced concrete, Encyclopaedia Britannica - http://www.britannica.com/EBchecked/topic/496607/reinforced-concrete