Fereshteh Afkari and  Davood Bagheri,  The Effect of Cooperation Teaching Method on Learning of Students in Primary Schools.   journal   = {International Journal of Educational and Pedagogical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    June 2010, vol. 42(6). 853 - 855
    [viewed 06 April 2020]. Available from: https://publications.waset.org/pdf/8382.