Saeed Gheni Noori /Falah kadhim Dhaigham. “ The Effectiveness of the Clear ARCS Motivational Model in Learning the Skill of Bottom-Facing Volleyball for Students”. (Humanities, Social and Applied Sciences) Misan Journal of Academic Studies , Vol. 20, no. 40, July 2021, pp. 22-31, https://misan-jas.com/index.php/ojs/article/view/177.