“Strategi Brand Extension dan Dampaknya terhadap Parent Brand Equity: Studi pada Varian Rasa Inovatif Ultra Milk” (2026) Professional Business Journal, 3(2), hlm. 87–98. Tersedia pada: https://jurnal.usp.ac.id/index.php/professional-bussiness-journal/article/view/245 (Diakses: 22 Juli 2026).