“The Impact of After-Sales Service Quality on Customer Satisfaction and Customer Loyalty of Middle-Upper Class Landed Housings”. Jurnal Teknik Industri: Jurnal Keilmuan dan Aplikasi Teknik Industri 20, no. 1 (June 25, 2018): 65–72. Accessed September 14, 2026. https://jurnalindustri.petra.ac.id/index.php/ind/article/view/20833.