Istanti E. EFFECT OF E-COMMERCE, PUBLIC RELATIONS AND CUSTOMER RELATIONSHIP MANAGEMENT ON PURCHASE DECISIONS (CASE STUDY OF OPPO BRAND SMARTPHONE USERS IN WTC SURABAYA). IJEBAR [Internet]. 2021 Oct. 22 [cited 2025 Jul. 1];5(3):2952-61. Available from: https://www.jurnal.stie-aas.ac.id/index.php/IJEBAR/article/view/3285