GOMES, Beatrix Chatarina Da; ALINE THERESIA GIRSANG; ELISABET L SIMBOLON. Pengaruh Lingkungan Pergaulan Terhadap Motivasi Belajar Mahasiswa Jurusan Matematika Angkatan 2025 Universitas Negeri Medan. QISTINA: Jurnal Multidisiplin Indonesia, [S. l.], v. 5, n. 1, p. 914–922, 2026. DOI: 10.57235/qistina.v5i1.8622. Disponível em: https://www.rayyanjurnal.com/index.php/qistina/article/view/8622. Acesso em: 17 jun. 2026.