IKA LATIFATUN NIKMAH. THE IMPLEMENTATION OF PROBLEM BASED LEARNING TO IMPROVE STUDENTS’ LEARNING ACHIEVEMENTS . International Education and Research Journal (IERJ), [S. l.], v. 4, n. 3, 2018. Disponível em: http://ierj.in/journal/index.php/ierj/article/view/1529. Acesso em: 25 jun. 2022.