The Importance of Visual Illustrations in Recommended Primary and Secondary School Textbooks in Calabar. Journal of Educational and Social Research, London, U.K., v. 2, n. 1, p. 161, 2012. Disponível em: https://www.richtmann.org/journal/index.php/jesr/article/view/11784.. Acesso em: 12 apr. 2025.