AHMED KHALEL, L.; لمى; JASIM MOHAMMED, A.; عبدالعالی. Kinds of crossed modules. Journal of Education and Science (JES), [S. l.], v. 22, n. 2, p. 354–369, 2009. DOI: 10.33899/edusj.2009.57689. Disponível em: https://rjps.uomosul.edu.iq/index.php/edusj/article/view/17486. Acesso em: 4 aug. 2025.