Tolba, Ehab Gouda Ahmed. “The Effect Of The Interaction Between Worked – Examples Strategy And Prior Knowledge In The Development Of Scientific Concepts And Well –And Ill-Structured Physical Problems Solving With First-Graders Secondary Students”. The International Journal for Talent Development 6, no. 1 (June 1, 2015). Accessed November 15, 2024. https://journals.ust.edu/index.php/IJTD/article/view/837.