MUHAMMAD Q. JAMEEL AHMED. The effectiveness of the two fields of learning in the two styles of self - group competition and their impact on learning the skills of the ace serve and defending the court in volleyball. Al-Qadisiyah Journal for Physical Education Science, [S. l.], v. 24, n. 1, p. 88–95, 2024. Disponível em: http://spojou.qu.edu.iq/index.php/qjpes/article/view/96. Acesso em: 17 may. 2024.