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.