Ahmed, Muthana, and Lina Yasin. “The Effect Program Teaching by Use Sign Language Supported by Cartoons in Teaching and Maintaining the Performance in Free Style Swimming for Deaf-Mute (8-10)years”. Journal of Physical Education, vol. 27, no. 2, June 2015, pp. 146-63, https://doi.org/10.37359/JOPE.V27(2)2015.580.