Limpavaralai, Metta, Laddawan Kinlumdrun, and Woraphun Mahasaranon. “The Factors Influencing Normal Expressive Language Development of Early Childhood In Sukhothai Province”. Journal of Nursing and Health Sciences 13, no. 4 (December 11, 2019): 78–90. Accessed September 29, 2022. https://he01.tci-thaijo.org/index.php/NurseNu/article/view/215873.