คลังวิทยานิพนธ์เเละงานวิจัย มหาวิทยาลัยอุบลราชธานี

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2009
Ratree Khrueaphan. (2009). The effects of call lesson in reducing the omission of 'BE' used with predicative adjectives. Faculty of Liberal Arts, Ubon Ratchathanee University, Ubon Ratchathani.