Y. T. Gee and  I. N. Umar,  The Effects of Drill and Practice Courseware on Students’ Achievement and Motivation in Learning English.   journal   = {International Journal of Educational and Pedagogical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    November 2014, vol. 96(12). 3812 - 3817
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/9999844.