Hayati HS, Asrizal A. Need Analysis to Develop Global Warming e-Module Integrated Problem Bases Learning Model to Improve Students’ 21st Century Skills. Department of Physics Universitas Negeri Padang [Internet]. 2023 Jul. 10 [cited 2024 Nov. 21];1(2):108-16. Available from: https://ple.ppj.unp.ac.id/index.php/ple/article/view/23