ÇELIK, M.; TEKBIYIK, A. The influence of activities based on GEMS with the theme of earth crust on the fourth grade students’ conceptual understanding and scientific process skills. Pegem Journal of Education and Instruction, [S. l.], v. 6, n. 3, p. 303–332, 2016. DOI: 10.14527/pegegog.2016.016. Disponível em: https://pegegog.net/index.php/pegegog/article/view/pegegog.2016.016. Acesso em: 26 oct. 2026.