Simamora EL. UPAYA PENINGKATAN AKTIVITAS BELAJAR MELALUI MODEL GROUP INVESTIGATION MATA PELAJARAN BAHASA INDONESIA KELAS VII-7 SMPN 1 NAMORAMBE. JH [Internet]. 2017 Jul. 2 [cited 2025 Jul. 7];6(2):111-7. Available from: https://jurnal.unimed.ac.id/2012/index.php/handayani/article/view/6524