Nguyen, M.T. and Nguyen, T.V. 2025. The effectiveness of using visual representations in organizing activities teaching the concept of time to 5-6-year-old preschoolers: A quasi-experimental study. Dong Thap University Journal of Science - Social Sciences and Humanities Issue. 14, 7 (May 2025), 20–31. DOI:https://doi.org/10.52714/dthu.14.7.2025.1558.