Maria E. de Boyrie and  Darlene Nelson and  James A. Nelson,  The Future of Electronic Money .   journal   = {International Journal of Economics and Management Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2007, vol. 3(3). 50 - 52
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/13052.