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Wulandari, Astri (2019) Cultural diversity in the use of subjects in Indonesian Senior High School E-Textbooks: a content analysis. Skripsi thesis, Sanata Dharma University.
Wulandari, Astri (2017) Students` perception on the use of debate activities in improving students` speaking skills in SMAN 8 Yogyakarta. Skripsi thesis, Sanata Dharma University.