“Strategi Brand Extension dan Dampaknya terhadap Parent Brand Equity: Studi pada Varian Rasa Inovatif Ultra Milk”, Prof. Bus. J., vol. 3, no. 2, hlm. 87–98, Jun 2026, Diakses: 22 Juli 2026. [Daring]. Tersedia pada: https://jurnal.usp.ac.id/index.php/professional-bussiness-journal/article/view/245