NAJDI, R. The Effects of Research-Based Strategies on Raising the Van Hiele Levels of Geometric Thinking. مجلة جامعة القدس المفتوحة للبحوث الإنسانية والاجتماعية, [S. l.], n. 19, 2017. Disponível em: https://journals.qou.edu/index.php/jrresstudy/article/view/1074. Acesso em: 29 2024.