Al-Alaween F, Al- Ayasrah A. Construct a Strategy Combines Two Strategies Based on the Constructivist Principles and Measure its Effect on Acquisition of Environmental Concepts Among Ninth Basic Grade Students and Development of their Attitudes Towards Environment. JJES [Internet]. 2016 Jun. 1 [cited 2025 Oct. 3];12(2):155-67. Available from: https://jjes.yu.edu.jo/index.php/jjes/article/view/648