Vera V. Levites, Anna V. Beloshistaya, Nataliya V. Ivanch, Oleg I. Lyash,. «Model-Based Educational Technique to Develop Mathematical Concepts in Preschoolers». Opción 350 (1): 2330-2362. Accedido julio 31, 2025. https://produccioncientifica.luz.edu.ve/index.php/opcion/article/view/27473.