TY - JOUR AU - Fatahi, Shahram AU - Karami, Jahanghir AU - Mohammadirad, Mansour TI - Analysis of Socio-economic Factors Affecting Happiness and Individual Labor Force Productivity: the case of Kermanshah Manufacturing Establishments JO - The Journal of Productivity Management VL - 10 IS - 1 SP - 7 EP - 36 PY - 2016 DO - ER -