Purba, Kezia, 		Junitha, I Ketut, AND 		Wirasiti, Ni Nyoman.
" THE DNA QUANTIFICATION IN SMOKER STUDENTS AND NON- SMOKING AT STATE UNIVERSITY OF MEDAN, MEDAN TEMBUNG DISTRICT, MEDAN CITY, NORTH SUMATRA PROVINCE" <em>SIMBIOSIS</em> [Online], Volume 10 Number 2 (2 September 2022)