Prit, Saren, and Mumuh Mulyana. “Membangun Keunggulan Bersaing Melalui Strategi Umbrella Brand”. Jurnal Ilmiah Manajemen Kesatuan 7, no. 3 (December 28, 2019): 303–312. Accessed May 6, 2024. https://jurnal.ibik.ac.id/index.php/jimkes/article/view/279.