Siri-orn Champatong,  Five Vital Factors Related to Employees’ Job Performance.   journal   = {International Journal of Economics and Management Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2013, vol. 80(8). 2429 - 2431
    [viewed 16 April 2024]. Available from: https://publications.waset.org/pdf/16241.