ถนอมนาค ภ, ภูติรัตน์ ป. The Acquisition of English Liquid Contrast by Northern Thai Speaking Learners. CPY [Internet]. 2014 Dec. 25 [cited 2024 May 14];25(2):13-27. Available from: https://so01.tci-thaijo.org/index.php/ejChophayom/article/view/27592