Hilmiyyah Silmi Fashihah; Badruli Martati; Lilik Binti Minawarti. Instilling the Character of Mutual Cooperation in Problem-Based Learning (PBL) Among Fifth Grade Elementary School Students: Penanaman Karakter Gotong Royong Dalam Problem Based Learning (PBL) Pada Peserta Didik Kelas V Sekolah Dasar. JPLED 2026, 6.