Silvia Maristy, H. ., and A.-N. Yasmin Syifanisena. “UPAYA TELEPHONE OPERATOR DALAM MENINGKATKAN KUALITAS PELAYANAN DI JAMBULUWUK MALIOBORO HOTEL YOGYAKARTA”. JURNAL NUSANTARA, vol. 3, no. 1, Feb. 2020, pp. 13-22, https://jurnal.akparda.ac.id/index.php/nusantara/article/view/14.