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Sari, Helen Marta (2015) Implementing drilling technique to XI AP class of SMK BOPKRI 1 Yogyakarta to improve their pronunciation. Skripsi thesis, Sanata Dharma University.
Sari, Helen Marta (2013) Implementing drilling technique to XI AP class of SMK BOPKRI 1 Yogyakarta to improve their pronunciation. Skripsi thesis, Sanata Dharma University.