2021. Analisa Pengaruh SOP ( Standard Operating Procedure ) Terhadap Kinerja Waiter Dan Waitress Di In Bloom Restoran Hotel Ayaartta Malioboro Yogyakarta, Indonesia. Journal of Tourism and Economic. 4, 1 (Jun. 2021), 73–84. DOI:https://doi.org/10.36594/jtec/wfrnje97.