PUTRI, Amelia; PUTRA, Amali. DEVELOPMENT OF STUDENT WORKSHEET PROBLEM BASED LEARNING MODEL ORIENTED BY CRITICAL THIKING ACTIVITIES IN VIBRATION, WAVE, AND BEEF TOPIC IN CLASS VIII SMPN 3 PADANG. Universe, [S. l.], v. 2, n. 1, p. 77–83, 2021. DOI: 10.24036/universe.v2i1.59. Disponível em: http://universe.ppj.unp.ac.id/index.php/universe/article/view/59. Acesso em: 18 apr. 2026.