Lismayuni L, Rambitan VM, Lumowa SV. THE EFFECTIVENESS OF PROBLEM - BASED LEARNING MODEL LEARNING DEVICES. IJER [Internet]. 2020 Nov. 2 [cited 2024 Nov. 24];7(02):51-5. Available from: https://journal.unj.ac.id/unj/index.php/ijer/article/view/23249