NST RR, Hasibuan MI, Elvina E. Strategic Email Marketing for Customer Retention: A Study of E-Commerce Practices in Panai Hulu. IJEDR [Internet]. 2025Sep.17 [cited 2026May12];6(4):2856-6. Available from: https://old.yrpipku.com/index.php/ijedr/article/view/9223