Application of QR Code In Improving Public Knowledge About Beyond Use Date (BUD) of Medicine In Tanjung Rejo Village Percut Sei Tuan Deli Serdang: Penerapan QR Code Dalam Peningkatan Pengetahuan Masyarakat Tentang Beyond Use Date (BUD) Obat di Desa Tanjung Rejo Percut Sei Tuan Deli Serdang. jukeshum [Internet]. 2025 Jan. 31 [cited 2026 Nov. 13];5(1):141-6. Available from: https://ojs.unhaj.ac.id/index.php/jukeshum/article/view/1198