M. H. Omar,  Minimizing Examinee Collusion with a Latin- Square Treatment Structure.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2009, vol. 27(3). 511 - 514
    [viewed 20 April 2024]. Available from: https://publications.waset.org/pdf/2110.