Sopianah, Ani, Sukarni Novita Sari, and Juardi. “Cost Control Function in Operational Cost Efficiency at Squid Restaurant By Grandin Hotel Grand Dafam Ancol Jakarta”. Hospitalitas : Journal of Tourism, Leisure and Hospitality Management 1, no. 1 (April 30, 2025): 52–64. Accessed December 5, 2025. https://journal.idscipub.com/index.php/hospitalitas/article/view/473.