ROSALINA, Rosalina; SYAHIR, Muhammad. Developing a Web-Based Information System to Enhance Operations in Hajj and Umrah Travel (Case Study: PT. Mutiara Cinta Imani). Ultima InfoSys : Jurnal Ilmu Sistem Informasi, [S. l.], v. 14, n. 2, p. 87–92, 2023. DOI: 10.31937/si.v14i2.3443. Disponível em: https://ejournals.umn.ac.id/index.php/SI/article/view/3443. Acesso em: 25 aug. 2025.