Rika Alamsyah; Lina Natamiharja; Rizka Handayani. 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. Dentika Dental J. 2012, 17, 128 - 133.