ALKHATEEB, M. A. Semiotic Characteristics of the 9th Grade Math Textbook. Pedagogika, [S. l.], v. 136, n. 4, p. 89–108, 2019. DOI: 10.15823/p.2019.136.6. Disponível em: https://ejournals.vdu.lt/index.php/Pedagogika/article/view/1124. Acesso em: 30 apr. 2025.