SAFITRI, Violetta; LESTARI, Tuti. THE EFFECT PROBLEM BASED LEARNING ASSISTED BY QUESTION CARDS ON CRITICAL THINGKING SKILLS ON ADDITIVE AND ADDICTIVE SUBSTANCES FOR VIII GRADE STUDENTS OF SMPN 38 PADANG. Universe, [S. l.], v. 5, n. 1, p. 51–57, 2024. DOI: 10.24036/universe.v5i1.585. Disponível em: http://universe.ppj.unp.ac.id/index.php/universe/article/view/585. Acesso em: 22 jul. 2026.