WASET
    A. Youseef and  F. Liu,  A New Framework to Model a Secure E-Commerce System.   journal   = {International Journal of Computer and Systems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2012, vol. 62(2). 159 - 165
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/3807.