WASET
    Chummanond Natchaya and  Rotchanakitumnuai Siriluck,  Determining the Online Purchasing Loyalty for Thai Herbal Products.   journal   = {International Journal of Economics and Management Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2010, vol. 40(4). 393 - 396
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/2420.