Rosalina, Rosalina, and Muhammad Syahir. “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 14, no. 2 (December 21, 2023): 87-92. Accessed May 9, 2024. https://ejournals.umn.ac.id/index.php/SI/article/view/3443.