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คลังวิทยานิพนธ์เเละงานวิจัย มหาวิทยาลัยอุบลราชธานี
] . (2017). An effect of a direct method on grade 5 students acquisition of verb inflectional morphemes (-s, -es, -ing, -ed) : a case study at Assumption college Ubon Ratchathani. Faculty of Liberal Arts, Ubon Ratchathanee University, Ubon Ratchathani .
. (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.