USANTO, U.; NURLAELA, L.; SOPIAN, A.; ALFIAH, F. Umrah Registration System Using Extreme Programming Method Towards Worship Tourism. International Journal of Cyber ​​and IT Service Management (IJCITSM), [S. l.], v. 3, n. 1, p. 22–31, 2022. DOI: 10.34306/ijcitsm.v3i1.104. Disponível em: https://iiast.iaic-publisher.org/ijcitsm/index.php/IJCITSM/article/view/104. Acesso em: 19 oct. 2025.