Aprilia Kartikasari, Isnaeni, Budi Usodo, and Riyadi. “The Effectiveness Open-Ended Learning and Creative Problem Solving Models to Improve Creative Thinking Skills”. Pegem Journal of Education and Instruction 12, no. 4 (October 1, 2022): 29–38. Accessed August 16, 2025. https://www.pegegog.net/index.php/pegegog/article/view/1699.