Napitupulu, Sabar. “Pengaruh Cost Leadership Dan Differentiation Strategy Terhadap Citra Produk PT. Asuransi Bumi Putra 1912”. CAKRAWALA 29, no. 2 (July 1, 2022): 1–10. Accessed November 29, 2024. https://jurnal.swins.ac.id/index.php/cakrawala/article/view/11.