Dwi Setyono Putro, A., T. Akiriningsih, and K. Cahyani Ermawati. “Efisiensi Program Aplikasi Opera Terhadap Produktivitas Departemen Front Office Di Montigo Resort Nongsa”. Jurnal Pariwisata Indonesia, vol. 15, no. 2, July 2020, pp. 15-23, http://jurnal.stpsahidsurakarta.ac.id/index.php/JPI/article/view/153.