Nguyen, Manh Tuan, and Thi Vui Nguyen. “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, vol. 14, no. 7, May 2025, pp. 20-31, doi:10.52714/dthu.14.7.2025.1558.