J. Sitorus, Mido Ester, Nina Fentiana, and Yenni Gustiani. 2020. “BAHAYA MEROKOK DI KALANGAN REMAJA SMP AMAL LUHUR NO.116 KOTA MEDAN”. Jurnal Abdimas Mutiara 1 (2):90-95. https://e-journal.sari-mutiara.ac.id/index.php/JAM/article/view/1316.