Adel Said, O. (2013). The effect of using some teaching aids as delayed feedback on learning free style- back stroke- Brest stroke swimming. , 25(2), 53-87.
Omar Adel Said. "The effect of using some teaching aids as delayed feedback on learning free style- back stroke- Brest stroke swimming". , 25, 2, 2013, 53-87.
Adel Said, O. (2013). 'The effect of using some teaching aids as delayed feedback on learning free style- back stroke- Brest stroke swimming', , 25(2), pp. 53-87.
Adel Said, O. The effect of using some teaching aids as delayed feedback on learning free style- back stroke- Brest stroke swimming. , 2013; 25(2): 53-87.