Mustafa, I. M. (2019) “Effect of The Percentage of The Contribution of Some Factors in The Implementation of The Lesson of Physical Education: For middle schools in Erbil Governorate”, KOYA UNIVERSITY JOURNAL OF HUMANITIES AND SOCIAL SCIENCES, 2(2), pp. 117–121. doi: 10.14500/kujhss.v2n2y2019.pp117-121.