Lee Bih Ni and  Nurul Asyikin Binti Hassan,  The Use of Mnemonic and Mathematical Mnemonic Method in Improving Historical Understanding.   journal   = {International Journal of Educational and Pedagogical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    January 2019, vol. 146(2). 93 - 97
    [viewed 26 January 2021]. Available from: https://publications.waset.org/pdf/10009984.