The ability of solving a mathematical problem and its relation to system thinking among fifth preparatory students. Journal Of Educational and Psychological Researches, [S. l.], v. 15, n. 59, p. 523–554, 2018. Disponível em: https://jperc.uobaghdad.edu.iq/index.php/jperc/article/view/106. Acesso em: 4 may. 2025.