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Sulastri, Sulastri (2017) The correlation between learning style and students’ speaking ability at grade VIII SMP Negeri 6 Panyabungan. Undergraduate thesis, IAIN Padangsidimpuan.
Sulastri, Sulastri (2013) Improving students’ self-confidence in speaking ability through simulation technique at grade x SMA Negeri 8 Padangsidimpuan. Undergraduate thesis, IAIN Padangsidimpuan.