عمر أ.ع.ح. and كنعان أ.ح.ع. 2019. The Extent of Availability of the Global Mathematics Standards in the Content of Geometry in the Mathematics Textbooks of (1st - 4th) grades from the Perspective of the Teachers in Tulkarm. Journal of Al-Quds Open University for Educational & Psychological Research & Studies. 9, 25 (Feb. 2019).