Al-Najadat MHF. The Effectiveness of Instructional Program based on Constructivism Theory on Acquiring Geographical Concepts among the Ninth Grade Students in Jordan. JEPS [Internet]. 2020 Apr. 30 [cited 2026 Jan. 24];4(16):70-52. Available from: https://journals.ajsrp.com/index.php/jeps/article/view/2401