AHMED ABDULLAH, S. The impact of the educational system using immediate feedback in learning the skills of numbers and sending from the bottom volleyball. Al-Rafidain Journal For Sport Sciences, [S. l.], v. 22, n. 70, p. 190–203, 2019. DOI: 10.33899/rajsport.2019.163307. Disponível em: https://rsprs.uomosul.edu.iq/index.php/rsprs/article/view/50089. Acesso em: 2 oct. 2025.