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สวัสดิสิงห์ พ. Deficiencies in Writing Skill of Undergraduate Students in Private Universities of Thailand :A Reflection of "Lacking". spurhs [internet]. 2018 Mar. 30 [cited 2026 Sep. 11];12(2):171-9. available from: https://so05.tci-thaijo.org/index.php/spurhs/article/view/117245