Noviani ET, Ismaya EA, Khamdun. Development of IPAS Learning Modules Based on Problem-Based Learning on Ecosystem Material for Elementary School Students. AJATeL [Internet]. 2023 Jun. 30 [cited 2024 Nov. 23];13(1):71-8. Available from: https://ojs.upsi.edu.my/index.php/AJATeL/article/view/9872