WASET
    Pushkar Umaranikar and  Chris Pollett,  An Open Source Advertisement System.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2016, vol. 114(6). 990 - 999
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/10004513.