Ikhsan, Masrul, Sukarni Novita Sari, and Juardi. “The Concierge’s Role in Improving the Quality of Front Office Department Services at Manhattan Hotel Jakarta”. Journal of Sustainable Tourism and Hotel Management 1, no. 1 (April 30, 2025): 21–32. Accessed May 12, 2026. https://journal.idscipub.com/index.php/sthm/article/view/309.