1. Bilal S. and Thomas H. R. (1990). “A comparative analysis of labor productivity of masons in seven countries.” PTI Report No. 9036 Pennsylvania State Univ. Pennsylvania Transp. Inst. University Park Pa. Mar.
2. Factors Affecting Masonry‐Labor Productivity
3. Sanders S. R. Thomas H. R. and Smith G. R. (1989). “An analysis of factors affecting labor productivity in masonry construction.” PTI Report No. 9003 Pennsylvania State Univ. Pennsylvania Transp. Inst. University Park Pa. Aug.
4. Factor Model of Construction Productivity