راكان قاسم عبد الله غ. The effect of using tow strategies of the cooperative learning in mathematics in the achievement and self-confidence of the second-stage intermediate students. BERJ [Internet]. 2007 Jul. 1 [cited 2025 Oct. 26];5(2):116-41. Available from: https://stats.uomosul.edu.iq/index.php/berj/article/view/39559