A Comparative Study of Textbook Readability and Students’ Comprehension Levels in Senior Secondary School Biology. Journal of Educational and Social Research, London, U.K., v. 3, n. 1, p. 109, 2013. Disponível em: https://www.richtmann.org/journal/index.php/jesr/article/view/12103.. Acesso em: 5 apr. 2025.