SARI, Putri Novita; FITRIATIEN, Sri Rahmawati; PRAYITNO, Lydia Lia. Students’ Cooperative Attitudes in Junior High School Mathematics Learning: A Study of the Influence of the Project-Based Learning Model on Integer Material. Plusminus: Jurnal Pendidikan Matematika, [S. l.], v. 5, n. 2, p. 383–394, 2025. DOI: 10.31980/plusminus.v5i2.2775. Disponível em: https://journal.institutpendidikan.ac.id/index.php/plusminus/article/view/2775. Acesso em: 1 may. 2026.