กัณวเศรษฐ อ., ชัยพิบาลสฤษดิ์ ด., and เครือโชติกุล ส. “Effect of Participation in Supporting Language Development Program towards Knowledge and Self-Efficacy of Pre-School Care Giver”. Vajira Nursing Journal, vol. 20, no. 1, Aug. 2018, pp. 40-53, https://he02.tci-thaijo.org/index.php/vnj/article/view/138787.