Du, T. N., H. A. . Nguyen, V. H. . Pham, D. D. . Nguyen, and . D. T. . Mai. “The Quality Assurance of Early Childhood Education in Preschools in the Mekong Delta, Vietnam: Integrating the CIPO and PDCA Frameworks”. International Journal of Learning, Teaching and Educational Research, vol. 25, no. 7, July 2026, pp. 326-51, https://www.ijlter.net/index.php/ijlter/article/view/2954.