Said al Gardani, S. A. (2019) “Availability Of Content Standards Of The National Council Of Mathematics Teachers (NCTM): Applied Study In Mathematics Courses For Grades 6, 7 And 8 In Oman: Analytical Descriptive Study”, Perdana: International Journal of Academic Research, 4(1), pp. 90-113. Available at: https://perdanajournal.com/index.php/perdanajournal/article/view/41 (Accessed: 20April2026).