Fajar Utama, Erniyanti, Fadlan, Soerya Respationo, Siti Nurkhotijah. LEGAL ANALYSIS OF THE EFFECTIVENESS OF THE POLICY OF REFUSAL OF ENTRY FOR FOREIGN CITIZENS IN THE FRAMEWORK OF MAINTAINING STATE SOVEREIGNTY AT THE SEA IMMIGRATION INSPECTION PLACE IN BATAM CITY (RESEARCH STUDY AT BATAM CENTER INTERNATIONAL PORT). JISHUP [Internet]. 2026 Sep. 11 [cited 2026 Sep. 18];4(4):2322-9. Available from: https://jishup.org/index.php/ojs/article/view/429