Rachmawati Y, Susilo S, Prasetyo APB. The Effectiveness of Problem Based Learning (PBL) with Open-Ended Approach on Problem Solving Ability. JPE [Internet]. 26Sep.2019 [cited 24Nov.2024];8(7):105-12. Available from: https://journal.unnes.ac.id/sju/jpe/article/view/34301