Ramansyah Hidayat (2024) “Analysis of the Impact of Competency Certification on Improving Hotel Employee Performance in the Priority Tourism Destination Bromo Tengger Semeru (DPP-BTS): (Case Study of Hotel Front Office Clerks)”, EKONOMIKA45 :  Jurnal Ilmiah Manajemen, Ekonomi Bisnis, Kewirausahaan, 11(2), pp. 999–1008. doi: 10.30640/ekonomika45.v11i2.2605.