Sirithongthaworn, S., Narkpongphun, A., Pongtaweeboon, N., Itsarapong, P., Kasemsuk, W., Pila, S., Phrommin, P., Langaphin, S., Sutthibuta, U., & Thanu, K. (2013). A Study of Child Developmental Norms for Children from birth to 5 years of age in Chiang Mai. International Journal of Child Development and Mental Health, 1(1), 7–18. Retrieved from https://he01.tci-thaijo.org/index.php/cdmh/article/view/67044