Cevik, Mustafa, and Cihad Senturk. “Multidimensional 21st Century Skills Scale: Validity and Reliability Study”. Cypriot Journal of Educational Sciences 14, no. 1 (March 28, 2019): 11–28. Accessed May 15, 2024. https://un-pub.eu/ojs/index.php/cjes/article/view/3506.