SITORUS, Grace Elicia; SAMOSIR, Martha Indah; SAGALA, Prihatin Ningsih; SIBARANI, Khoirunnisa; DHUHA, Nadira Kaylana; MUNTHE, Tiolina Maria. Hubungan Kualitas Tidur Terhadap Konsentrasi Belajar Matematika Siswa Kelas VII-3 SMPN 4 Medan. Mandalika Mathematics and Educations Journal, [S. l.], v. 7, n. 1, p. 204–219, 2025. Disponível em: http://jurnalfkip.unram.ac.id/index.php/MANDALIKA/article/view/8790. Acesso em: 4 apr. 2025.