AVISCA, Keke Citra Wahyu; MAWARDI, Mawardi; ASTUTI, Suhandi. RETRACTION: Peningkatan Critical Thinking dan Collaborative Skill Matematika melalui Model Group Investigation Berbantuan Magic Ball. JP (Jurnal Pendidikan) : Teori dan Praktik, [S. l.], v. 3, n. 2, p. 97–103, 2018. DOI: 10.26740/jp.v3n2.p97-103. Disponível em: https://journal.unesa.ac.id/index.php/jp/article/view/2280. Acesso em: 15 mar. 2025.