PRAVITA SAKTIYANI; HARI SUTRISNO. IMPLEMENTATION OF LEARNING MODELS PBL- REDIPPER FOR INCREASE ABILITY THINK CRITICAL AND COLLABORATION STUDENTS ON ATOMIC STRUCTURE MATERIAL. International Journal of Social Science, Educational, Economics, Agriculture Research and Technology (IJSET), [S. l.], v. 5, n. 7, p. 3442–3447, 2026. Disponível em: https://ijset.org/index.php/ijset/article/view/1952. Acesso em: 24 may. 2026.