Dyan Wicaksono, Adityo, and Hestya Patrie. “UPAYA MENINGKATKAN LOYALITAS DAN PELAYANAN TERHADAP CUSTOMER DI TARA TOUR & TRAVEL (PT. TARUNA DIRGANTARA)”. IDEALIS : InDonEsiA JournaL Information System, vol. 2, no. 6, Nov. 2019, pp. 238-43, https://jom.fti.budiluhur.ac.id/IDEALIS/article/view/2424.