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Harsono, Yohanes Mujiyo (1982) Learning difficulties in present perfect tense and the English verb ``have``. Skripsi thesis, Sanata Dharma University.
Marcellino, M. (1982) The misuse of prepositions ``at, in, on and to`` indicating a point of arrival. Skripsi thesis, Sanata Dharma University.
Soedjatmiko, Wuri (1982) A preliminary study of students` errors in learning gerunds. Skripsi thesis, Sanata Dharma University.