LEUNG, C. B. Peirce’s Concept of Signs and Kindergarten Literacy. International Journal of Learning, Teaching and Educational Research, [S. l.], v. 17, n. 5, p. 104–121, 2018. Disponível em: https://ijlter.net/index.php/ijlter/article/view/679. Acesso em: 25 may. 2026.