แก้วบุตร พ., and แก้วมณี ธ. “Problems and Guidelines for Error Correction of the Chinese Pronunciation of Thai Students: A Case Study of Chinese Language Competitions of the Schools under the Supervision of the Office of the Basic Education Commission”. JOURNAL OF SOUTHERN TECHNOLOGY, vol. 12, no. 1, May 2019, pp. 50-62, https://so04.tci-thaijo.org/index.php/journal_sct/article/view/107130.