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Andra R., Airlangga (2022) Laporan Tugas Akhir Penerapan Standard Operating Procedure (Sop) Room Service Di Departemen Food And Beverage Service Hotel Hyatt Regency Yogyakarta Periode 6 September 2021 – 5 Maret 2022. Diploma thesis, Sekolah Tinggi Pariwisata AMPTA Yogyakarta.