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Kusumawardhani, Herdianti and Syafrizal, Syafrizal and Ildi, Kurniawan (2020) THE EFFECT OF REINFORCEMENT TOWARD STUDENTS’ SPEAKING ABILITY. ( AN EXPERIMENT AT THE TENTH GRADE STUDENTS OF SMAN 7 BENGKULU ACADEMIC YEAR 2018/2019 ). Undergraduated thesis, UNIVERSITAS BENGKULU.