HURRIYAT, K. .; DILSHODA, M. . Didactic Principles of Educational Content Based on the Principle of Concentrism in Primary Class Textbooks. International Journal on Integrated Education, [S. l.], v. 6, n. 2, p. 128–134, 2023. DOI: 10.31149/ijie.v6i2.4009. Disponível em: https://journals.researchparks.org/index.php/IJIE/article/view/4009. Acesso em: 18 sep. 2026.