Assmer Al – Hayane, M., محمد, M. Dawood Al- Bana, K., خالد, H. Ahmed Al-Sowedi, A. and احمد . “ The Transfer of the effect of vertical and inverted vertical learning by using learning tools in learning the skill of sstrike in Volley Ball. Al-Rafidain Journal For Sport Sciences (RJSS). 14, 48 (), 115–128. DOI:https://doi.org/10.33899/rajsport.2008.50028.