WASET
    R. M. Kashim,  The Conceptual and Procedural Knowledge of Rational Numbers in Primary School Teachers.   journal   = {International Journal of Educational and Pedagogical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    February 2016, vol. 111(3). 933 - 937
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/10004143.