Cahya, Virdies Nur C, Refius Setyanto, and Paradise Paradise. “Analysis of the Effectiveness of Loyalty Membership Programs in Increasing Customer Retention Using Net Promoter Score (NPS) With Information System Support”. Eduvest - Journal of Universal Studies 5, no. 9 (September 8, 2025): 10974–10983. Accessed May 30, 2026. https://eduvest.greenvest.co.id/index.php/edv/article/view/52060.