UMAR, Bahariyah; JATMIKO, Budi; RAHARJO, Raharjo. DEVELOPMENT OF NATURAL SCIENCE LEARNING INSTRUMENTS WITH CONTEXTUAL APPROACH USING PROBLEM SOLVING MODEL TO IMPROVE CRITICAL THINKING SKILL OF JUNIOR HIGH SCHOOL STUDENTS. JPPS (Jurnal Penelitian Pendidikan Sains), [S. l.], v. 7, n. 2, p. 1501–1506, 2018. DOI: 10.26740/jpps.v7n2.p1501-1506. Disponível em: https://journal.unesa.ac.id/index.php/jpps/article/view/2931. Acesso em: 14 jun. 2025.