Amertadana, Ketut Alit. “The Identification of Verbal and Non Verbal Expressions Used By Waiter and Waitress in Serving Guest at Puri Bagus Hotel”. Jurnal Penelitian Mahasiswa Indonesia, vol. 4, no. 3, July 2024, pp. 348-63, https://jurnal.stkipahsingaraja.ac.id/index.php/jpmi/article/view/873.