“Development of Thematic Skill Learning Based on the 21th Century Skill Model for Fourth Graders”. JOURNAL OF TEACHING AND LEARNING IN ELEMENTARY EDUCATION (JTLEE) 3, no. 1 (February 1, 2020): 47–57. Accessed October 13, 2025. https://jtlee.ejournal.unri.ac.id/index.php/JTLEE/article/view/127.