WASET
    G. Robles and  A. Stifi and  José L. Ponz-Tienda and  S. Gentes,  Labor Productivity in the Construction Industry -Factors Influencing the Spanish Construction Labor Productivity-.   journal   = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    September 2014, vol. 94(10). 1061 - 1070
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/9999560.