A. S. Sarghiwa1, Abdulasalam. 2023. “Developing the Content of Science Books in the Preparatory Stage According to the Next Generation of Science Standards (NGSS) for the Dimension of Central Ideas”. AL-Mukhtar Journal of Educational Sciences 3 (6):46-20. https://omu.edu.ly/journals/index.php/mjes/article/view/1409.