“HUBUNGAN KEBIASAAN MEROKOK DENGAN STATUS PERIODONTAL TUKANG BECAK DI SEKITAR KAMPUS USU MEDAN: RELATIONSHIP BETWEEN SMOKING AND PERIODONTAL STATUS OF PEDICAP RIDER AROUND USU CAMPUS MEDAN” (2012) Dentika: Dental Journal, 17(2), pp. 128–133. doi:10.32734/dentika.v17i2.1757.