Effect of Polya George’s Problem Solving Model on Students’ Achievement and Retention in Algebra. Journal of Educational and Social Research, London, U.K., v. 3, n. 6, p. 41, 2013. Disponível em: https://www.richtmann.org/journal/index.php/jesr/article/view/1718.. Acesso em: 26 dec. 2024.