Faroogh Khakzad and  Marzieh Dehghani and  Elahe Hejazi,  Investigation of the Effect of Teaching a Thinking and Research Lesson by Cooperative and Traditional Methods on the Creativity of Sixth Grade Students.   journal   = {International Journal of Educational and Pedagogical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    June 2018, vol. 138(6). 865 - 869
    [viewed 15 October 2019]. Available from: https://publications.waset.org/pdf/10009314.