غفور ت. و. (2020) “The Impacts of Pictures and Animation Accompanied by A Changing Sequence of Exercises Scheduling : On Learning and Retaining Some Basic Volleyball Skills of University Students”, Koya University Journal of Humanities and Social Sciences, 3(2), pp. 189-197. doi: 10.14500/kujhss.v3n2y2020.pp189-197.