Niyomvit, Kanyapat, Charunee Klaojang, Jariyaphon Wannachot, and Charuwan Tarmong. 2019. “The Development of Operational Guideline for Enhancing Early Childhood Well Being at the Child Development Center, Phrapokklao Nursing College, Chanthaburi”. Journal of Phrapokklao Nursing College, Chanthaburi 30 (1). Chanthaburi, Thailand:15-26. https://he01.tci-thaijo.org/index.php/pnc/article/view/168496.