Tarmidi, Didi, and Suci Rahmina Pratiwi. “The Effect of Sales Promotion and Service Innovation Toward Ovo Customer Loyalty”. Enrichment : Journal of Management 13, no. 1 (May 1, 2023): 554-558. Accessed May 22, 2026. https://enrichment.iocspublisher.org/index.php/enrichment/article/view/1308.