Ferianto M, Widodo S, Siregar N. Optimalising Digital Marketing and Service Quality to Enhance Customer Loyalty in the Digital-Economy Era. IJEC [Internet]. 2025 Jul. 20 [cited 2025 Dec. 5];4(2):942-50. Available from: https://ejournal.ipinternasional.com/index.php/ijec/article/view/1456