WASET
    Ya Hong Dong and  Conrad T.C. Wong and  S. Thomas Ng and  James M.W. Wong,  Life Cycle Assessment of Precast Concrete Units.   journal   = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2013, vol. 75(3). 230 - 235
    [viewed 11 May 2024]. Available from: https://publications.waset.org/pdf/10792.