Pecson R, Sarmiento J. Integrating 21st-Century Skills into Instructional Materials for Sustainable Education. Indones. J. Instr. Media Model. [Internet]. 2024 Nov. 30 [cited 2025 Feb. 22];6(2):89-9. Available from: https://journal.univetbantara.ac.id/index.php/ijimm/article/view/5934