Novi Indriyani Sitepu, et al. “Strategi Marketing Syariah Berbasis Kualitas Spiritual Dalam Perspektif Agen Asuransi Syariah”. Conference on Economic and Business Innovation (CEBI), vol. 1, no. 1, Mar. 2021, pp. 594-05, https://jurnal.widyagama.ac.id/index.php/cebi/article/view/138.