Nilsuwankhosit, Chalermchai, Prangtip Sirichuenvichit, and Worapol Boonyaban. 2017. “A Comparison of Duration of Speech Accuracy Between Co-articulation Exercise and General Exercise in Children with Articulation Disorders”. Research Medical Journal 39 (4):234-43. https://he02.tci-thaijo.org/index.php/ramajournal/article/view/80465.