Measuring optimism and pessimism among university students. Journal Of Educational and Psychological Researches, [S. l.], v. 15, n. 56, p. 547–572, 2018. Disponível em: https://jperc.uobaghdad.edu.iq/index.php/jperc/article/view/185. Acesso em: 4 may. 2025.