Jana M. Havigerová and  Jiří Haviger,  Questions in the School.   journal   = {International Journal of Educational and Pedagogical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    June 2012, vol. 66(6). 1185 - 1188
    [viewed 23 April 2024]. Available from: https://publications.waset.org/pdf/12929.