Khammas R, Sabhan H. The Effect Of Special Exercises Using Teaching Aids on Some Basic Skills In Volleyball For First Year Secondary School Students. jope [Internet]. 2019 Dec. 28 [cited 2026 Jul. 9];31(4):32-9. Available from: https://www.jcope.uobaghdad.edu.iq/index.php/jcope/article/view/888