Mishchenko, Natalia, Elena Romanova, Alexander Skaliy, Tetiana Skaliy, y Witold Kowalski. «Strengthening the Physical Health of Preschoolers by Means of Fitball». VIREF Revista de Educación Física 10, no. 2 (mayo 26, 2021): 126–144. Accedido enero 31, 2025. https://revistas.udea.edu.co/index.php/viref/article/view/344569.