Kanyapat U. Tapao,  The Operation Strategy and Public Relations Trend for Public Relations Strategies Development in Thailand.   journal   = {International Journal of Economics and Management Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2015, vol. 108(12). 4427 - 4430
    [viewed 19 January 2021]. Available from: https://publications.waset.org/pdf/10006872.