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Siregar FA. PENGARUH MODEL KOOPERATIF TIPE NHT TERHADAP HASIL BELAJAR SISWA KELAS VIII SMP NEGERI 18 MEDAN. JPF Unimed [Internet]. 2012 Jun. 1 [cited 2025 Jul. 5];1(1):33-8. Available from: https://jurnal.unimed.ac.id/2012/index.php/jpf/article/view/3379