Utama, Alfin. “Analisis Model Proporsi Tabarru’ Dan Ujrah Pada Bisnis Asuransi Jiwa Syariah Di Indonesia”. ManBiz: Journal of Management and Business 3, no. 1 (October 5, 2023): 200-213. Accessed May 16, 2024. https://journal.laaroiba.ac.id/index.php/manbiz/article/view/5245.