Kurniawan PW. PENGARUH POSITIVE REINFORCEMENT TERHADAP HASIL BELAJAR SEJARAH SISWA DI SMA ADIGUNA BANDAR LAMPUNG. lentera [Internet]. 2018 May 10 [cited 2026 Jun. 10];11(1):71-80. Available from: https://jurnal2.stkippgribl.ac.id/index.php/lentera/article/view/375