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 (May 20, 2026): 10–16. Accessed June 27, 2026. https://journal.idscipub.com/index.php/sthm/article/view/309.