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Hasibuan, Fannisa (2025) Analisis gangguan berbicara gagap: studi kasus “R” di Sibuhuan Kecamatan Barumun. Undergraduate thesis, UIN Syekh Ali Hasan Ahmad Addary Padangsidimpuan.
Sari, Rina (2016) The students’ vowels pronunciation at grade VIII SMP N 2 Ulu Pungkut Mandailing Natal. Undergraduate thesis, IAIN Padangsidimpuan.