Muhammad Sujatno Setyawan, and Suparno. “Effective Strategy for Enforcing Cross-Border Drug Laws Through Package Delivery”. Greenation International Journal of Law and Social Sciences 3, no. 3 (November 17, 2025): 833–838. Accessed January 19, 2026. https://research.e-greenation.org/GIJLSS/article/view/568.