Simanjuntak E, Valentina. PENYULUHAN PENGGUNAAN TRACER DI PUSKESMAS SERING KOTA MEDAN. Ji-SOMBA [Internet]. 2022May31 [cited 2025Feb.23];1(2):36-41. Available from: https://jurnal.uimedan.ac.id/index.php/Ji-SOMBA/article/view/786