The effect of classroom and extracurricular sports activities on aggressive behavior and some components of physical fitness among middle school students. Journal of the College of Basic Education, [S. l.], v. 1, n. SI, p. 252–263, 2022. DOI: 10.35950/cbej.v1iSI.5973. Disponível em: https://cbej.uomustansiriyah.edu.iq/index.php/cbej/article/view/5973.. Acesso em: 4 jun. 2026.