Sagdy, C., Huren-ool, S., Damba, I., Ondar, C. and Mongush, I. (2019) “Progressing subject-spatial environment project of pre-school organization in Tuva”, Opción, 340, pp. 635-656. Available at: https://produccioncientifica.luz.edu.ve/index.php/opcion/article/view/30274 (Accessed: 31October2025).