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 Jan. 31];6(2):111-7. Available from: http://103.242.233.34/index.php/handayani/article/view/6524