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 Journal, v. 17, n. 2, p. 128 - 133, 6 Dec. 2012.