“Dari Diskon Menuju Loyalitas: Peran Keberhasilan Price Promotion Dan E-Service Quality Apps Dalam Membentuk Brand Advocacy J.CO”. Professional Bussiness Journal, vol. 4, no. 1, July 2026, pp. 26-39, https://jurnal.usp.ac.id/index.php/professional-bussiness-journal/article/view/247.