Solihat, Asri. “Layanan Purna Jual Pada Produk Otomotif”. Business Innovation and Entrepreneurship Journal 1, no. 1 (May 4, 2019): 6-10. Accessed July 24, 2025. https://ejournals.fkwu.uniga.ac.id/index.php/BIEJ/article/view/5.